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目錄TOC\o"1-3"\h\u第一章緒論 2第二章地質(zhì)背景 62.1蘇魯造山帶地質(zhì)概況 62.2仰口及將軍山地區(qū)地質(zhì)概況及部分熔融 8第三章樣品描述 113.1.野外描述:野外接觸關(guān)系 113.2室內(nèi)薄片描述 133.2.1柯石英榴輝巖(YK173-5,YK173-5b) 133.2.2.云母片巖(YKN149-1) 153.2.3多硅白云母榴輝巖(YK173-7) 163.2.4淺色體(YK173-15) 16第四章分析方法 18第五章鋯石內(nèi)部結(jié)構(gòu)特征分析 195.1柯石英榴輝巖(YK173-5和YK173-5b) 205.2云母片巖(YKN149-1) 215.3多硅白云母榴輝巖(YK173-7) 225.4淺色體(YK173-15) 23第六章包裹體測試數(shù)據(jù)分析 256.1柯石英榴輝巖(YK173-5和YK173-5b) 256.2云母片巖(YKN149-1) 286.3多硅白云母榴輝巖(YK173-7) 356.4淺色體(YK173-15) 36第七章討論部分 377.1鋯石內(nèi)部結(jié)構(gòu)中的原巖信息 377.2包裹體中蘊藏的大陸深俯沖與折返過程中的信息 387.2.1俯沖深度和穩(wěn)壓范圍 387.2.2熔流體性質(zhì) 38第八章結(jié)論 40致謝 41參考文獻 42蘇魯造山帶超高壓變質(zhì)巖中鋯石的包裹體研究第一章緒論歸納總結(jié)榴輝巖(變基性巖)部分熔融及熔體在俯沖折返過程中的意義俯沖-碰撞造山帶的形成、演化和地球動力學過程是板塊構(gòu)造理論的核心內(nèi)容。傳統(tǒng)板塊構(gòu)造學說認為,只有洋殼俯沖帶才是殼幔相互作用最為活躍的地區(qū)。在大洋板塊俯沖過程中,蝕變的洋殼玄武巖及其上覆沉積物隨著溫度和壓力的升高,在經(jīng)歷變質(zhì)脫水和部分熔融后,能夠釋放大量的富水流體。該流體進入上覆地幔楔并發(fā)生化學交代作用,從而引發(fā)地幔部分熔融形成大規(guī)模的同俯沖島弧巖漿作用ADDINEN.CITE<EndNote><Cite><Author>Hawkesworth</Author><Year>1991</Year><RecNum>140</RecNum><DisplayText>(Hawkesworth,Hergtetal.1991)</DisplayText><record><rec-number>140</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557130123"guid="b3178631-50ee-41b9-adc7-8c374f3f989b">140</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Hawkesworth,ChristopherJohn</author><author>Hergt,JM</author><author>Ellam,RM</author><author>McDermott,F</author></authors></contributors><titles><title>Elementfluxesassociatedwithsubductionrelatedmagmatism</title><secondary-title>PhilosophicalTransactionsoftheRoyalSocietyofLondon.SeriesA:PhysicalandEngineeringSciences</secondary-title></titles><periodical><full-title>PhilosophicalTransactionsoftheRoyalSocietyofLondon.SeriesA:PhysicalandEngineeringSciences</full-title></periodical><pages>393-405</pages><volume>335</volume><number>1638</number><dates><year>1991</year></dates><isbn>0962-8428</isbn><urls></urls></record></Cite></EndNote>(Hawkesworth,Hergtetal.1991)。對于洋殼俯沖過程中所伴隨的流體活動,在礦物巖石學及地球化學方面近年來取得了許多重要進展。相對于大洋板塊,大陸地殼本身相對缺水。而且,大量研究表明,大陸深俯沖帶板片俯沖-折返過程中,超高壓變質(zhì)巖變質(zhì)脫水和部分熔融弱化其流變強度,促進板片折返,引發(fā)廣泛殼-幔相互作用、巖漿活動和礦化作用快速俯沖的大陸板塊在進變質(zhì)過程中僅發(fā)生有限的脫水作用,大部分的水仍然賦存在俯沖板塊內(nèi)部,在深俯沖陸殼的折返過程中存在著明顯的流體活動。含羥基礦物的分解、名義上無水礦物中結(jié)構(gòu)羥基和分子水的出溶,以及折返過程中由于壓力突然降低引起的流體包裹體破裂,都有可能釋放大量的流體。這不僅可以為變質(zhì)過程提供大量流體,也可能導致折返過程板片自身部分熔融導致大規(guī)模的地幔交代和島弧巖漿活動。已有研究表明,大陸深俯沖過程不但會產(chǎn)生超高壓變質(zhì)巖也會引發(fā)明顯的殼幔相互作用。鑒于大陸地殼物質(zhì)組成上與地幔物質(zhì)組成的巨大差異,大陸地殼的深俯沖和折返,必然會對上覆大陸巖石圈和大陸板塊匯聚邊界的結(jié)構(gòu)、組成、變形和演化進程等造成巨大影響。這一過程在傳統(tǒng)的板塊構(gòu)造學說中并未涉及,因而至今未能得到合理的解釋。對大陸俯沖帶板片與地幔楔巖石相互作用的深入研究,無疑將改進現(xiàn)行的地球動力學觀,為發(fā)展和完善板塊構(gòu)造理論提供新的科學依據(jù)。大陸碰撞過程中熔/流體的組成和演化是研究大陸深俯沖動力學的重要內(nèi)容,而超高壓巖石記錄了大陸俯沖和折返過程中的熔/流體-巖石相互作用,因而是研究大陸碰撞過程中熔/流體組成和演化的天然實驗室。ADDINEN.CITE<EndNote><Cite><Author>高曉英</Author><Year>2011</Year><RecNum>19</RecNum><DisplayText>(高曉英,李姝寧etal.2011)</DisplayText><record><rec-number>19</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1544323426"guid="35ca4d27-317e-480b-a795-01b45370a396">19</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>高曉英</author><author>李姝寧</author><author>鄭永飛</author></authors></contributors><titles><title>超高壓變質(zhì)礦物中的多相固體包裹體研究進展</title><secondary-title>巖石學報</secondary-title></titles><periodical><full-title>巖石學報</full-title></periodical><pages>469-489</pages><volume>27</volume><number>2</number><dates><year>2011</year></dates><urls></urls></record></Cite></EndNote>(高曉英,李姝寧etal.2011)概括榴輝巖部分熔融相關(guān)的研究現(xiàn)狀以及有關(guān)熔體成份的待解決科學問題近年來對天然超高壓榴輝巖部分熔融的研究進展迅速,成為榴輝巖新的研究熱點。近來于柴北緣、大別-蘇魯?shù)瘸邏涸焐綆?nèi)識別出榴輝巖部分熔融現(xiàn)象,熔體產(chǎn)物主要為榴輝巖內(nèi)保存的淺色脈體或榴輝巖內(nèi)寄主礦物中的固態(tài)包裹體。近年來,圍繞超高壓巖石中固態(tài)包裹體的形成時間、演化過程及其所反映的俯沖帶超高壓變質(zhì)熔/流體的組成和性質(zhì),進行了大量的研究工作。榴輝巖造巖礦物中多相固體包裹體因其周圍多發(fā)育放射狀裂隙而使其成因造成多解性。蘇魯超高壓榴輝巖存在以下兩個待解決問題:1.陸殼俯沖深度是否可達到200km?目前僅一例報道,且無重復樣品ADDINEN.CITE<EndNote><Cite><Author>Ye</Author><Year>2000</Year><RecNum>133</RecNum><DisplayText>(Ye,Congetal.2000)</DisplayText><record><rec-number>133</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557123921"guid="d7da88b5-373c-464a-8995-19db2d046092">133</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Ye,Kai</author><author>Cong,Bolin</author><author>Ye,Danian</author></authors></contributors><titles><title>Thepossiblesubductionofcontinentalmaterialtodepthsgreaterthan200km</title><secondary-title>Nature</secondary-title></titles><periodical><full-title>nature</full-title></periodical><pages>734</pages><volume>407</volume><number>6805</number><dates><year>2000</year></dates><isbn>1476-4687</isbn><urls></urls></record></Cite></EndNote>(Ye,Congetal.2000)。相平衡計算得出為至少為5.5個GPa。未有超高壓特定溫壓礦物樣品直接證明。ADDINEN.CITE<EndNote><Cite><Author>Xia</Author><Year>2018</Year><RecNum>122</RecNum><DisplayText>(Xia,Brownetal.2018)</DisplayText><record><rec-number>122</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1555465973"guid="6ca23c82-b5d3-405a-bac4-7b5cad868088">122</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Xia,Bin</author><author>Brown,Michael</author><author>Wang,Lu</author><author>Wang,SongJie</author><author>Piccoli,Philip</author></authors></contributors><titles><title>PhaseequilibriummodelingofMT–UHPeclogite:acasestudyofcoesiteeclogiteatYangkouBay,Sulubelt,EasternChina</title><secondary-title>JournalofPetrology</secondary-title></titles><periodical><full-title>JournalofPetrology</full-title></periodical><dates><year>2018</year></dates><urls></urls></record></Cite></EndNote>(Xia,Brownetal.2018)2.榴輝巖部分熔融機制傳統(tǒng)認為是折返中-后期的多硅白云母脫水分解熔融。然而最新發(fā)表文章提出假說,認為部分熔融在近峰期即可以超臨界流體形式存在,熔融后期低壓階段(~1.5GPa)才發(fā)生多硅白云母部分熔融。ADDINEN.CITE<EndNote><Cite><Author>Wang</Author><Year>2016</Year><RecNum>141</RecNum><DisplayText>(Wang,Wangetal.2016)</DisplayText><record><rec-number>141</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557195486"guid="1ff7220c-72ca-4500-8135-517583eed564">141</key></foreign-keys><ref-typename="ConferenceProceedings">10</ref-type><contributors><authors><author>Wang,Songjie</author><author>Wang,Lu</author><author>Brown,Michael</author></authors></contributors><titles><title>Evolutionofsupercriticalfluidindeeplysubductedcontinentalcrust:acasestudyofcompositegranite-quartzveinsintheSulubelt,China</title><secondary-title>AGUFallMeetingAbstracts</secondary-title></titles><dates><year>2016</year></dates><urls></urls></record></Cite></EndNote>(Wang,Wangetal.2016)鋯石是一種伴生巖石礦物即副礦物,變質(zhì)巖常見的副礦物,在地質(zhì)年代學中起著重要的作用。近年來,也是如此發(fā)現(xiàn)它的機械強度可以幫助它作為保存的絕佳容器,且可在較寬的溫壓范圍內(nèi)保持穩(wěn)定,封閉溫度高,一旦捕獲礦物包體,即使遭受后期強烈構(gòu)造熱事件的改造,包體礦物的結(jié)構(gòu)及其化學成分也很難被改變。因此,鋯石通常被認為是早期高壓礦物最好的“保存容器”。(劉福來,沈其韓etal.2002)ADDINEN.CITE<EndNote><Cite><Author>Liu</Author><Year>2001</Year><RecNum>136</RecNum><DisplayText>(Liu,Yeetal.2001)</DisplayText><record><rec-number>136</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557125119"guid="10d34d6b-0afe-4f66-a799-4d4fb5a7d9a8">136</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Liu,Jingbo</author><author>Ye,Kai</author><author>Maruyama,Shegnori</author><author>Cong,Bolin</author><author>Fan,Hongrui</author></authors></contributors><titles><title>Mineralinclusionsinzirconfromgneissesintheultrahigh-pressurezoneoftheDabieMountains,China</title><secondary-title>TheJournalofGeology</secondary-title></titles><periodical><full-title>TheJournalofGeology</full-title></periodical><pages>523-535</pages><volume>109</volume><number>4</number><dates><year>2001</year></dates><isbn>0022-1376</isbn><urls></urls></record></Cite></EndNote>(Liu,Yeetal.2001)因此,深熔鋯石中固態(tài)包裹體的成份、結(jié)構(gòu)和溫壓估算研究可為驗證熔融溫壓范圍的假說乃至約束深俯沖深度這兩個問題提供良好約束。由于后期的分離結(jié)晶或與圍巖發(fā)生反應(yīng)、或熔體來源可能為榴輝巖和圍巖的混合,天然榴輝巖中淺色脈體可能無法充分地約束榴輝巖所產(chǎn)生的初始熔體成分。而固態(tài)包裹體的存在開辟了一個新的切入路徑。引出對將軍山,仰口榴輝巖部分熔融的包裹體這一手段研究本論文的研究對象為蘇魯造山帶仰口超高壓地體中的榴輝巖及其圍巖云母片巖和將軍山地區(qū)的淺色體。仰口超高壓地體中的榴輝巖是蘇魯造山帶目前報導過的經(jīng)歷最深俯沖的榴輝巖,其埋藏壓力至少可達5.5-7GpaADDINEN.CITE<EndNote><Cite><Author>Xia</Author><Year>2018</Year><RecNum>122</RecNum><DisplayText>(Ye,Congetal.2000,Xia,Brownetal.2018)</DisplayText><record><rec-number>122</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1555465973"guid="6ca23c82-b5d3-405a-bac4-7b5cad868088">122</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Xia,Bin</author><author>Brown,Michael</author><author>Wang,Lu</author><author>Wang,SongJie</author><author>Piccoli,Philip</author></authors></contributors><titles><title>PhaseequilibriummodelingofMT–UHPeclogite:acasestudyofcoesiteeclogiteatYangkouBay,Sulubelt,EasternChina</title><secondary-title>JournalofPetrology</secondary-title></titles><periodical><full-title>JournalofPetrology</full-title></periodical><dates><year>2018</year></dates><urls></urls></record></Cite><Cite><Author>Ye</Author><Year>2000</Year><RecNum>133</RecNum><record><rec-number>133</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557123921"guid="d7da88b5-373c-464a-8995-19db2d046092">133</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Ye,Kai</author><author>Cong,Bolin</author><author>Ye,Danian</author></authors></contributors><titles><title>Thepossiblesubductionofcontinentalmaterialtodepthsgreaterthan200km</title><secondary-title>Nature</secondary-title></titles><periodical><full-title>nature</full-title></periodical><pages>734</pages><volume>407</volume><number>6805</number><dates><year>2000</year></dates><isbn>1476-4687</isbn><urls></urls></record></Cite></EndNote>(Ye,Congetal.2000,Xia,Brownetal.2018)仰口地區(qū)榴輝巖為蘇魯造山帶俯沖最深的超高壓變質(zhì)巖;榴輝巖內(nèi)Ap+Cpx+Rt出溶體指示曾存在超硅石榴子石,表明陸殼深俯沖>200kmADDINEN.CITE<EndNote><Cite><Author>Ye</Author><Year>2000</Year><RecNum>137</RecNum><DisplayText>(Ye,Yaoetal.2000)</DisplayText><record><rec-number>137</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557125430"guid="7a6f59b8-d107-4de6-888c-ba54910736b8">137</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Ye,Kai</author><author>Yao,Yupeng</author><author>Katayama,Ikuo</author><author>Cong,Bolin</author><author>Wang,Qingchen</author><author>Maruyama,Shigenori</author></authors></contributors><titles><title>Largearealextentofultrahigh-pressuremetamorphismintheSuluultrahigh-pressureterraneofEastChina:newimplicationsfromcoesiteandomphaciteinclusionsinzirconofgraniticgneiss</title><secondary-title>Lithos</secondary-title></titles><periodical><full-title>Lithos</full-title></periodical><pages>157-164</pages><volume>52</volume><number>1-4</number><dates><year>2000</year></dates><isbn>0024-4937</isbn><urls></urls></record></Cite></EndNote>(Ye,Yaoetal.2000);且是世界首例(唯一)造山帶榴輝巖中保存有粒間柯石英,指示折返期間“干”的流體環(huán)境ADDINEN.CITE<EndNote><Cite><Author>Ye</Author><Year>1996</Year><RecNum>143</RecNum><DisplayText>(LiouandZhang1996,Ye,Hirajimaetal.1996)</DisplayText><record><rec-number>143</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557196964"guid="a28bcd49-5c29-475b-9c47-fc05e2309f5b">143</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Ye,Kai</author><author>Hirajima,T</author><author>Ishiwatari,A</author></authors></contributors><titles><title>ThediscoveryofintergranularcoesiteineclogiteofYangkou,Qingdaoanditssignificance</title><secondary-title>ChineseScienceBulletin</secondary-title></titles><periodical><full-title>ChineseScienceBulletin</full-title></periodical><pages>1407-1408</pages><volume>41</volume><number>15</number><dates><year>1996</year></dates><urls></urls></record></Cite><Cite><Author>Liou</Author><Year>1996</Year><RecNum>144</RecNum><record><rec-number>144</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557197053"guid="4dc179fc-b276-40c7-96f0-64d787da5045">144</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Liou,JG</author><author>Zhang,AndrY</author></authors></contributors><titles><title>Occurrencesofintergranularcoesiteinultrahigh-ProcksfromtheSuluregion,easternChina:implicationsforlackoffluidduringexhumation</title><secondary-title>AmericanMineralogist</secondary-title></titles><periodical><full-title>AmericanMineralogist</full-title></periodical><pages>1217-1221</pages><volume>81</volume><number>9-10</number><dates><year>1996</year></dates><isbn>1945-3027</isbn><urls></urls></record></Cite></EndNote>(LiouandZhang1996,Ye,Hirajimaetal.1996);仍保留輝長巖向榴輝巖相變痕跡ADDINEN.CITE<EndNote><Cite><Author>Liou</Author><Year>1996</Year><RecNum>144</RecNum><DisplayText>(LiouandZhang1996)</DisplayText><record><rec-number>144</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557197053"guid="4dc179fc-b276-40c7-96f0-64d787da5045">144</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Liou,JG</author><author>Zhang,AndrY</author></authors></contributors><titles><title>Occurrencesofintergranularcoesiteinultrahigh-ProcksfromtheSuluregion,easternChina:implicationsforlackoffluidduringexhumation</title><secondary-title>AmericanMineralogist</secondary-title></titles><periodical><full-title>AmericanMineralogist</full-title></periodical><pages>1217-1221</pages><volume>81</volume><number>9-10</number><dates><year>1996</year></dates><isbn>1945-3027</isbn><urls></urls></record></Cite></EndNote>(LiouandZhang1996),易保留超高壓階段變形-變質(zhì)信息,進而可能獲得最接近與初始熔融的環(huán)境和熔體成分信息。部分熔融可顯著改變深俯沖板片的流變學特征和構(gòu)造變形行為,進而對解釋深俯沖超高壓變質(zhì)巖的快速折返、殼幔相互作用、陸殼生長具有重要啟示作用。超高壓榴輝巖一直以來被認為不能發(fā)生大尺度部分熔融,是超高壓變質(zhì)巖研究的前沿。而在將軍山地區(qū)報道世界首例深俯沖榴輝巖折返過程中可發(fā)生大規(guī)模部分熔融,形成混合巖化榴輝巖ADDINEN.CITE<EndNote><Cite><Author>Wang</Author><Year>2014</Year><RecNum>130</RecNum><DisplayText>(Wang,Kuskyetal.2014)</DisplayText><record><rec-number>130</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557123563"guid="638fe2d4-bce2-4b10-9311-9a7fa488cddb">130</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Wang,Lu</author><author>Kusky,TimothyM</author><author>Polat,Ali</author><author>Wang,Songjie</author><author>Jiang,Xingfu</author><author>Zong,Keqing</author><author>Wang,Junpeng</author><author>Deng,Hao</author><author>Fu,Jianmin</author></authors></contributors><titles><title>PartialmeltingofdeeplysubductedeclogitefromtheSuluorogeninChina</title><secondary-title>Naturecommunications</secondary-title></titles><periodical><full-title>Naturecommunications</full-title></periodical><pages>5604</pages><volume>5</volume><dates><year>2014</year></dates><isbn>2041-1723</isbn><urls></urls></record></Cite></EndNote>(Wang,Kuskyetal.2014)。圖1仰口灣地區(qū)的榴輝巖P-T軌跡ADDINEN.CITE<EndNote><Cite><Author>Xia</Author><Year>2018</Year><RecNum>122</RecNum><DisplayText>(Xia,Brownetal.2018)</DisplayText><record><rec-number>122</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1555465973"guid="6ca23c82-b5d3-405a-bac4-7b5cad868088">122</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Xia,Bin</author><author>Brown,Michael</author><author>Wang,Lu</author><author>Wang,SongJie</author><author>Piccoli,Philip</author></authors></contributors><titles><title>PhaseequilibriummodelingofMT–UHPeclogite:acasestudyofcoesiteeclogiteatYangkouBay,Sulubelt,EasternChina</title><secondary-title>JournalofPetrology</secondary-title></titles><periodical><full-title>JournalofPetrology</full-title></periodical><dates><year>2018</year></dates><urls></urls></record></Cite></EndNote>(Xia,Brownetal.2018)此P-T軌跡包括了四種榴輝巖樣品分別為包括兩個帶有多硅白云母的榴輝巖(YK128-12和YKS-5),一個藍晶石榴輝巖(WYKK-3)和一個雙礦物榴輝巖(YK5-2)。模擬相圖分為五個階段分別為早期等溫降壓階段開始脫羥基水;然后繼續(xù)退變形成含多硅白云母榴輝巖--超高壓流體;在折返后期發(fā)生多硅白云母分解熔融;最終繼續(xù)退變即粗粒脈體中的多硅白云母分解熔融和細脈中退變后成合晶。由此可知仰口地區(qū)的榴輝巖經(jīng)歷了俯沖-折返過程。在本團隊前期年代學工作可以看出柯石英榴輝巖、云母片巖、淺色體的變質(zhì)年齡是有很大差距的,柯石英榴輝巖的變質(zhì)年齡為250.1±5.2Ma,云母片巖的變質(zhì)年齡為224.7±9.1Ma,而淺色體的變質(zhì)年齡為220.2±3.5Ma,由此可見柯石英榴輝巖經(jīng)歷的俯沖-折返過程較云母片巖早,云母片巖的俯沖-折返過程比淺色體所經(jīng)歷早。鋯石的年代學數(shù)據(jù)更好的為鋯石中捕獲的包裹體服務(wù),即定位某一詳細時間的俯沖深度、溫度、壓力及此時的熔流體成分和環(huán)境。表一仰口灣及將軍山地區(qū)超高壓巖石年代學數(shù)據(jù)(引自團隊為發(fā)表數(shù)據(jù))故選擇挑選仰口灣地區(qū)的柯石英榴輝巖(YK173-5和YK173-5b),多硅白云母榴輝巖(YK173-7),云母片巖(YKN149-1)和將軍山地區(qū)的淺色體(YK173-15)樣品的鋯石進行研究。

第二章地質(zhì)背景2.1蘇魯造山帶地質(zhì)概況蘇魯造山帶又稱為蘇魯超高壓變質(zhì)帶,該帶位于中國山東東南部,為長度超過2000公里超高壓秦嶺-大別-蘇魯中央造山帶即陸陸碰撞造山帶的一部分,秦嶺-大別-蘇魯中央造山帶是世界上規(guī)模最大、保存最好的超高壓變質(zhì)帶,是華北板塊與揚子板塊俯沖-碰撞-折返的產(chǎn)物,夾持于揚子板塊和華北板塊之間。秦嶺-大別-蘇魯中央造山帶被NEE向的左行郯廬斷裂將切錯,形成西部的大別超高壓變質(zhì)帶與東側(cè)的蘇魯超高壓變質(zhì)帶(圖2)ADDINEN.CITEADDINEN.CITE.DATA(Ye,Hirajimaetal.1996,Ye,Yaoetal.2000,Wang,Kuskyetal.2014)。蘇魯超高壓-高壓變質(zhì)帶呈NE-SE走向,規(guī)模大約有750km長,180km寬。西起郯廬斷裂,北起威海-榮成,經(jīng)青島-膠南-日照-莒南,向西南延伸至東海,東南側(cè)以嘉山-響水斷裂為邊界,轉(zhuǎn)為SSW延至張八嶺一帶,與揚子克拉通相鄰。西北側(cè)以五蓮-青島-煙臺斷裂為邊界,此前認為該斷裂為蘇魯造山帶地區(qū)與華北克拉通的界限,但部分最近的研究表明,這條斷裂實際上定義了蘇魯造山帶(俯沖的揚子克拉通)和秦嶺微大陸的界限,而與華北克拉通的邊界則在更加靠北的地方。ADDINEN.CITE<EndNote><Cite><Author>許志琴</Author><Year>2003</Year><RecNum>135</RecNum><DisplayText>(許志琴,張澤明etal.2003)</DisplayText><record><rec-number>135</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557124844"guid="ad849359-0a28-4494-b319-e5d32b74ead7">135</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>許志琴</author><author>張澤明</author><author>劉福來</author><author>楊經(jīng)綏</author><author>李海兵</author><author>楊天</author><author>南邱</author><author>海峻</author><author>李天福</author><author>孟繁聰</author></authors></contributors><titles><title>蘇魯高壓一超高壓變質(zhì)帶的折返構(gòu)造及折返機制</title><secondary-title>地質(zhì)學報</secondary-title></titles><periodical><full-title>地質(zhì)學報</full-title></periodical><pages>433-450</pages><volume>77</volume><number>4</number><dates><year>2003</year></dates><urls></urls></record></Cite></EndNote>(許志琴,張澤明etal.2003)蘇魯造山帶內(nèi)的主要巖石類型為花崗巖片麻巖、副長片麻巖、云母片巖、大理巖和kyanite石英巖,包裹著大小不等的榴輝巖和鎂鐵質(zhì)-超鎂鐵質(zhì)巖體超高壓變質(zhì)巖多為新元古代原巖年齡,華北克拉通下?lián)P子克拉通深俯沖及終端縫合作用,經(jīng)歷了三疊紀超高壓-高壓變質(zhì)作用。ADDINEN.CITE<EndNote><Cite><Author>許志琴</Author><Year>2003</Year><RecNum>135</RecNum><DisplayText>(許志琴,張澤明etal.2003,鄭永飛,葉凱etal.2008)</DisplayText><record><rec-number>135</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557124844"guid="ad849359-0a28-4494-b319-e5d32b74ead7">135</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>許志琴</author><author>張澤明</author><author>劉福來</author><author>楊經(jīng)綏</author><author>李海兵</author><author>楊天</author><author>南邱</author><author>海峻</author><author>李天福</author><author>孟繁聰</author></authors></contributors><titles><title>蘇魯高壓一超高壓變質(zhì)帶的折返構(gòu)造及折返機制</title><secondary-title>地質(zhì)學報</secondary-title></titles><periodical><full-title>地質(zhì)學報</full-title></periodical><pages>433-450</pages><volume>77</volume><number>4</number><dates><year>2003</year></dates><urls></urls></record></Cite><Cite><Author>鄭永飛</Author><Year>2008</Year><RecNum>112</RecNum><record><rec-number>112</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1554711284"guid="5225e274-164f-4893-a937-e6796f250edf">112</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>鄭永飛</author><author>葉凱</author><author>張立飛</author></authors></contributors><titles><title>大陸深俯沖與超高壓變質(zhì)的化學地球動力學</title><secondary-title>礦物巖石地球化學通報</secondary-title></titles><periodical><full-title>礦物巖石地球化學通報</full-title></periodical><dates><year>2008</year></dates><urls></urls></record></Cite></EndNote>(許志琴,張澤明etal.2003,鄭永飛,葉凱etal.2008)依據(jù)巖石組合和變質(zhì)作用特征,蘇魯造山帶分為南面的高壓帶和北部的超高壓帶。其中,超高壓變質(zhì)帶主體巖性為各種類型的花崗質(zhì)片麻巖,其中夾雜有各類副片麻巖、大理巖、云母片巖、含藍晶石的石英巖。此外區(qū)域內(nèi)還出露有大量榴輝巖和超基性巖的透鏡體,規(guī)模大小從數(shù)厘米到上百米不等,具有代表性的是毛北榴輝巖,中國大陸科學鉆探主孔就位于此巖體之上。這些超高壓變質(zhì)巖擁有新元古代的原巖年齡,并在揚子克拉通與華北克拉通的碰撞和深俯沖事件中經(jīng)歷三疊紀超高壓-高壓變質(zhì)作用:由于大洋巖石圈的俯沖導致?lián)P子板塊與華北板塊的碰撞以及大陸深層物質(zhì)的深俯沖與折返。ADDINEN.CITE<EndNote><Cite><Author>許志琴</Author><Year>2003</Year><RecNum>135</RecNum><DisplayText>(許志琴,張澤明etal.2003)</DisplayText><record><rec-number>135</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557124844"guid="ad849359-0a28-4494-b319-e5d32b74ead7">135</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>許志琴</author><author>張澤明</author><author>劉福來</author><author>楊經(jīng)綏</author><author>李海兵</author><author>楊天</author><author>南邱</author><author>海峻</author><author>李天福</author><author>孟繁聰</author></authors></contributors><titles><title>蘇魯高壓一超高壓變質(zhì)帶的折返構(gòu)造及折返機制</title><secondary-title>地質(zhì)學報</secondary-title></titles><periodical><full-title>地質(zhì)學報</full-title></periodical><pages>433-450</pages><volume>77</volume><number>4</number><dates><year>2003</year></dates><urls></urls></record></Cite></EndNote>(許志琴,張澤明etal.2003)高壓變質(zhì)帶主體巖性為強退變質(zhì)的花崗質(zhì)片麻巖、各類副片麻巖類,夾雜有石英片巖、石英云母片巖、大理巖、藍晶石石英巖、綠簾斜長角閃巖以及少量藍片巖等,在這些巖石中的鋯石中,常常保存有文石+多硅白云母+石榴石+石英等高壓包體礦物,但并沒有發(fā)現(xiàn)柯石英等指示超高壓環(huán)境的礦物包體,表明這一區(qū)域的巖石只經(jīng)歷了高壓變質(zhì)作用ADDINEN.CITE<EndNote><Cite><Author>劉福來</Author><Year>2009</Year><RecNum>147</RecNum><DisplayText>(劉福來and劉平華2009)</DisplayText><record><rec-number>147</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557217998"guid="ddceedec-5d50-4bd4-bb3c-18a23cc5f11b">147</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>劉福來</author><author>劉平華</author></authors></contributors><titles><title>北蘇魯仰口地區(qū)變輝長巖中鋯石U-Pb定年,微量元素和Hf同位素特征及其地質(zhì)意義[J]</title><secondary-title>巖石學報</secondary-title></titles><periodical><full-title>巖石學報</full-title></periodical><pages>2113r2131</pages><volume>25</volume><number>9</number><dates><year>2009</year></dates><urls></urls></record></Cite></EndNote>(劉福來and劉平華2009)。蘇魯造山帶前寒武紀變質(zhì)地層發(fā)育較差,除去連云港一帶及乳山育黎一帶有較連續(xù)的大片地層出露外,其他絕大部分地區(qū)的地層均呈小的殘片出現(xiàn),其分布面積不到變質(zhì)基底巖系的10%。主要地層單位有:新太古代-古元古代膠南表殼巖組合,中-新元古代錦屏巖群、云臺巖群及震旦紀朋河石巖組。圖2蘇魯造山帶地質(zhì)圖ADDINEN.CITE<EndNote><Cite><Author>Wang</Author><Year>2014</Year><RecNum>130</RecNum><DisplayText>(Wang,Kuskyetal.2014)</DisplayText><record><rec-number>130</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557123563"guid="638fe2d4-bce2-4b10-9311-9a7fa488cddb">130</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>Wang,Lu</author><author>Kusky,TimothyM</author><author>Polat,Ali</author><author>Wang,Songjie</author><author>Jiang,Xingfu</author><author>Zong,Keqing</author><author>Wang,Junpeng</author><author>Deng,Hao</author><author>Fu,Jianmin</author></authors></contributors><titles><title>PartialmeltingofdeeplysubductedeclogitefromtheSuluorogeninChina</title><secondary-title>Naturecommunications</secondary-title></titles><periodical><full-title>Naturecommunications</full-title></periodical><pages>5604</pages><volume>5</volume><dates><year>2014</year></dates><isbn>2041-1723</isbn><urls></urls></record></Cite></EndNote>(Wang,Kuskyetal.2014)蘇魯高壓-超高壓變質(zhì)帶的演化分為四個時期,第一個時期為揚子板塊的陸殼深俯沖事件(約220-242Ma),蘇魯高壓、超高壓變質(zhì)時代已報道的有榴輝巖的Sm-Nd年齡為265Ma、221-228Ma和U-Pb年齡為217Ma。副片麻巖的原巖的碎屑鋯石年齡為345-743Ma,花崗質(zhì)片麻巖原巖鋯石年齡大于680Ma,說明參與深俯沖的巖石包括了揚子板塊的基底及古生代蓋層;另外威海含柯石英石榴子石橄欖巖的SHRIMP法U-Pb年齡為221±12Ma,與石榴石橄欖巖伴生的含柯石英榴輝巖的SHRIMP法U-Pb年齡為228±29Ma,代表了其峰期變質(zhì)年齡,說明來自北中國板塊地幔楔的部分超鎂質(zhì)巖塊也參與了深俯沖作用。俯沖巖片中在深俯沖過程中形成超高壓花崗質(zhì)片麻巖帶-超高壓副片麻巖帶-高壓中溫變質(zhì)帶-高壓低溫變質(zhì)帶的自下而上序列。與此同時,在揚子北緣(張八嶺一帶)變質(zhì)基底與震旦紀—三疊紀沉積蓋層之間形成大型韌性滑脫剪切帶,伴隨高壓變質(zhì)作用,高壓變質(zhì)礦物藍閃石呈NS向排列,自北往南的剪切,滑脫事件的測年數(shù)據(jù)有232-216Ma,230-190Ma,245.1Ma,226-244.2Ma,可以認為揚子北緣基底/蓋層之間的大型滑脫事件是揚子板塊陸殼深俯沖事件的淺部反映。也就是說,在蘇魯高壓—超高壓變質(zhì)地體之上,曾有印支褶皺蓋層覆蓋,可與現(xiàn)在的東秦嶺相比。ADDINEN.CITE<EndNote><Cite><Author>許志琴</Author><Year>2003</Year><RecNum>135</RecNum><DisplayText>(許志琴,張澤明etal.2003,許志琴,楊經(jīng)綏etal.2010)</DisplayText><record><rec-number>135</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557124844"guid="ad849359-0a28-4494-b319-e5d32b74ead7">135</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>許志琴</author><author>張澤明</author><author>劉福來</author><author>楊經(jīng)綏</author><author>李海兵</author><author>楊天</author><author>南邱</author><author>海峻</author><author>李天福</author><author>孟繁聰</author></authors></contributors><titles><title>蘇魯高壓一超高壓變質(zhì)帶的折返構(gòu)造及折返機制</title><secondary-title>地質(zhì)學報</secondary-title></titles><periodical><full-title>地質(zhì)學報</full-title></periodical><pages>433-450</pages><volume>77</volume><number>4</number><dates><year>2003</year></dates><urls></urls></record></Cite><Cite><Author>許志琴</Author><Year>2010</Year><RecNum>134</RecNum><record><rec-number>134</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557124553"guid="959d1749-182b-4544-82bd-1cc16d2faee4">134</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>許志琴</author><author>楊經(jīng)綏</author><author>嵇少丞</author><author>張澤明</author><author>李海兵</author><author>劉福來</author><author>張建新</author><author>吳才來</author><author>李忠海</author><author>梁鳳華</author></authors></contributors><titles><title>中國大陸構(gòu)造及動力學若干問題的認識</title><secondary-title>地質(zhì)學報</secondary-title></titles><periodical><full-title>地質(zhì)學報</full-title></periodical><pages>1-29</pages><volume>84</volume><number>1</number><dates><year>2010</year></dates><urls></urls></record></Cite></EndNote>(許志琴,張澤明etal.2003,許志琴,楊經(jīng)綏etal.2010)第二時期為高壓超高壓變質(zhì)帶折返事件(220-200Ma)。在蘇魯超高壓帶中,新的SHRIMP法U-Pb定年結(jié)果還表明,超高壓副片麻巖的折返年齡為202-219Ma,超高壓花崗質(zhì)片麻巖折返年齡為209-219Ma,說明各類超高壓變質(zhì)巖的折返時限相同與最新發(fā)表的運用39Ar-40Ar測年方法獲得的超高壓變質(zhì)帶韌性剪切帶和退變質(zhì)事件年齡220Ma、213Ma和204Ma相近。隨著大陸俯沖板片的快速折返,發(fā)生退變質(zhì)反應(yīng)作用及形成折返構(gòu)造,印支褶皺蓋層受到強烈的頂蝕。ADDINEN.CITE<EndNote><Cite><Author>許志琴</Author><Year>2003</Year><RecNum>135</RecNum><DisplayText>(許志琴,張澤明etal.2003)</DisplayText><record><rec-number>135</rec-number><foreign-keys><keyapp="EN"db-id="s5xpddr245spp6e55fzx5f9qe5pxtteppxf0"timestamp="1557124844"guid="ad849359-0a28-4494-b319-e5d32b74ead7">135</key></foreign-keys><ref-typename="JournalArticle">17</ref-type><contributors><authors><author>許志琴</author><author>張澤明</author><author>劉福來</author><author>楊經(jīng)綏</author><author>李海兵</author><author>楊天</author><author>南邱</author><author>海峻</author><author>李天福</author><author>孟繁聰</author></authors></contributors><titles><title>蘇魯高壓一超高壓變質(zhì)帶的折返構(gòu)造及折返機制</title><secondary-title>地質(zhì)學報</secondary-title></titles><periodical><full-title>地質(zhì)學報</full-title></periodical><pages>433-450</pages><volume>77</volume><number>4</number><dates><year>2003</year></dates><urls></urls></record></Cite></EndNote>(許志琴,張澤明etal.2003)折返后的200-150Ma期間地質(zhì)記錄較少,可能為擠壓匯聚應(yīng)力向伸展應(yīng)力轉(zhuǎn)換階段,蘇魯高壓—超高壓變質(zhì)帶開始緩慢抬升,北部有少量的早燕山花崗巖侵入。ADDINEN.CITE<EndNote><Cite><Author>許志琴</Author><Year>2003</Year><RecNum>135</RecNum><DisplayText>(許志琴,張澤明etal.2003)</Dis

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