| 王令全,陈丽娟,李文智,赵玉龙,郭晓南.新疆阿尔金塔什达坂地区巴什库尔干岩群变质岩地球化学特征及地质意义[J].矿产勘查,2025,(1):55-66 |
| 新疆阿尔金塔什达坂地区巴什库尔干岩群变质岩地球化学特征及地质意义 |
| Geochemical characteristics and geological significance of metamorphic rocks of Baxkorgan Rock Group, Tashidaban area, Altyn, Xinjiang |
| 投稿时间：2024-08-14 |
| DOI：10.20008/j.kckc.202501006 |
| 中文关键词: 巴什库尔干岩群 地球化学 原岩恢复 源区特征 构造环境 |
| 英文关键词: Baxkorgan Rock Group geochemistry restoration of metamorphic protolith source region charac.teristics tectonic environment |
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| 中文摘要: |
| 新疆阿尔金塔什达坂地区巴什库尔干岩群发育一套绿片岩相变质沉积岩夹火山岩。本文通过野外地质和岩石地球化学特征研究，根据岩石组合、原岩特征不同，将其划分为原岩为一套泥灰质、泥质、砂质沉积岩夹碳酸盐岩、基性火山岩建造的 4个岩组。该岩群稀土和微量元素特征及配分形式的一致，显示不同岩组的同源特征，通过物源分析，源区物质以中酸性火山质组分为主。该岩群整体在一个较活动的构造环境中沉积，与大陆边缘盆地形成阶段地壳的伸展拉张相关联，不同岩组构造稳定性、沉积物成熟度以及源区风化条件的差异反映了地壳整体伸展条件下构造环境有所变化。中元古代初期巴什库尔干岩群开始沉积，长城纪末期的构造热事件使其发生绿片岩相变质，该过程是对中元古代塔里木板块裂解事件的响应。 |
| 英文摘要: |
| A set of greenschist facies metasedimentary rocks intercalated with volcanic rocks is distributed inthe Baxkorgan Rock Group in the Tashidaban area of Altyn, Xinjiang. By studying geological and geochemical char.acteristics of rocks in the field, based on different rock assemblages and protolith characteristics, it can be divided into four rock groups composed of marlitic, argillaceous and sandy sedimentary rocks with carbonate rocks and ba.sic volcanic rocks. The characteristics and distribution forms of REE and trace elements of this rock group are con.sistent, which shows the homology characteristics of different rock groups. Through provenance analysis, the materi.als in the source area are mainly medium acid volcanic components. The metamorphic rocks of the Baxkorgan rockgroup deposited in a relatively active tectonic environment, which is correlated with the extension and tension of thecrust during the formation satage of the continental margin basin. Different petrofabric show differences in the struc.tural stability, sediment maturity and weathering conditions in their source region. This reflects changes occurred inthe tectonic environment under crustal extension. The Baxkorgan rock group began to deposit in the early Mesopro.terozoic era and the tectono-thermal event at the end of Changchengian Period caused greenschist facies metamor.phism, which was a response to the breakup of paleo-Tarim plate in the Mesoproterozoic era. |
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