大陆碰撞过程中的巴罗式变质作用及原地深熔作用:以南阿尔金为例

于胜尧; 张建新; 李三忠; 孙德有; 李云帅; 彭银彪

大陆碰撞过程中的巴罗式变质作用及原地深熔作用:以南阿尔金为例

- 1.
  中国海洋大学海洋地球科学学院, 海底科学与探测技术教育部重点实验室, 青岛 266100;青岛海洋科学与技术国家实验室海洋地质功能实验室, 青岛 266061;吉林大学地球科学学院, 长春 130061
- 2.
  中国地质科学院地质研究所, 北京 100037
- 3.
  中国海洋大学海洋地球科学学院, 海底科学与探测技术教育部重点实验室, 青岛 266100;青岛海洋科学与技术国家实验室海洋地质功能实验室, 青岛 266061
- 4.
  吉林大学地球科学学院, 长春 130061
- 5.
  天津大学表层地球科学系统科学研究院, 天津 300072
基金项目:
本文受国家自然科学基金项目（41572053）资助.

收稿日期: 2016-07-03

修回日期: 2016-10-11

刊出日期: 2016-12-31

“Barrovian-type” metamorphism and in situ anatexis during continental collision: A case study from the South Altun Mountains, western China

- 1.
  Key Laboratory of Submarine Geosciences and Prospecting Technique, Ministry of Education;College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China;College of Earth Sciences, Jilin University, Changchun 130061, China
- 2.
  Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
- 3.
  Key Laboratory of Submarine Geosciences and Prospecting Technique, Ministry of Education;College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
- 4.
  College of Earth Sciences, Jilin University, Changchun 130061, China
- 5.
  Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China

Received Date: 03 July 2016

Revised Date: 11 October 2016

Publish Date: 31 December 2016

摘要

摘要: 南阿尔金吐拉地区所出露的变质泥质岩和变质基性岩普遍经历了中压麻粒岩相变质作用，其中变泥质岩以出现石榴子石+夕线石+长石+黑云母+石英为特征，而基性麻粒岩则以石榴子石+单斜辉石+紫苏辉石+斜长石+石英为特征，具有典型中压相系的麻粒岩相变质作用矿物组合，即显示“巴罗式”变质作用特征。野外宏观特征显示这套变泥质岩普遍经历了原地深熔作用，并局部发生混合岩化作用。岩相学观察结果显示泥质片麻岩保留了关键的深熔作用显微结构证据：（1）石榴子石内部发育有钾长石、石英和斜长石组成的矿物集合体，可能代表了早期熔体的假象；（2）黑云母颗粒边界发育尖锐的、不规则的微斜长石，而且黑云母边界溶蚀明显，形成锯齿状不规则的边界，指示深熔作用可能与黑云母的分解密切相关，即黑云母可能为深熔作用的主要反应相；（3）石英、斜长石或石榴子石颗粒边界发育圆珠状不规则的钾长石，而且颗粒边界或三联点中尖锐状钾长石与周围矿物的形成较小的二面角，有些甚至相互连通呈网络状，这也与它们继承了熔体结构特征一致；（4）不规则钾长石（或微斜长石）分布在石榴子石和夕线石附近，指示石榴子石和夕线石可能为深熔作用的残留相。锆石U-Pb定年结果显示麻粒岩相变质作用和相关深熔作用时代基本一致，主要发生在~450Ma。因此，吐拉地区的中压麻粒岩相变质作用和深熔作用明显要晚于南阿尔金地区榴辉岩和高压麻粒岩的峰期变质时代40~50Myr，而是与榴辉岩折返过程中麻粒岩相叠加变质作用的时代较为接近。但南阿尔金~450Ma的变质作用、深熔作用和岩浆作用是否为独立的构造热事件抑或深俯冲板片折返阶段的产物，这还需要今后进一步的工作验证。
- 南阿尔金 /
- "巴罗式"变质作用 /
- 深熔作用
Abstract: Both metapelite and metabasite experienced medium-pressure granulite-facies metamorphism in the Tula area, South Altun. The metapelite is mainly composed of garnet+sillimanite+feldspar+biotite+quartz, and the mafic granulite consists of garnet+clinopyroxene+orthopyroxene+plagioclase+quartz. Anatexis of the metapelite is evidenced by petrological study in field and microscopy texture:(1)mineral assemblage of K-feldspar+quartz+plagioclase within garnet represents pseudomorphism of earlier melts; (2) microcline recognized along grain boundary of irregular biotite, indicating breakdown of biotite; (3) string of K-feldspar along boundary of quartz, plagioclase or K-feldspar; (4) irregular K-feldspar along garnet and sillimanite, suggesting that the garnet and sillimanite represent the residuum.Zircon U-Pb data indicate that both granulite-facies metamorphism and anatexis occurred simultaneously at~450Ma. Therefore, medium-pressure granulite-facies metamorphism and anatexis occurred 40~50Myr later than the eclogite and HP granulite in the South Altun. However, it is controversial that the~450Ma metamorphism, anatexis and magmatism define an independent tectonothermal event or overprinting of deep subducted continental slab.
- South Altyn Mountains /
- "Barrovian-type" metamorphism /
- Anatexis

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