| 田光昊,胡新茁,侯红星,刘航,刘博,马永君.巴颜喀拉北部上三叠统清水河组构造环境与物源分析——来自碎屑岩岩石地球化学、U-Pb锆石测年的约束[J].矿产勘查,2022,13(10):1413-1429 |
| 巴颜喀拉北部上三叠统清水河组构造环境与物源分析——来自碎屑岩岩石地球化学、U-Pb锆石测年的约束 |
| Tectonic environment and provenance analysis of the Late Triassic Qingshuihe formation in northern Bayan Har: Constraints from clastic rock geochemistry and U-Pb zircon dating |
| 投稿时间：2021-09-08 |
| DOI：10.20008/j.kckc.202210001 |
| 中文关键词: 清水河组 碎屑岩 U-Pb锆石测年 物源分析 |
| 英文关键词: Qingshuihe formation clastic rocks U-Pb zircon dating provenance analysis |
| 基金项目:本文受中国地质调查局项目“西北沿边及特殊地区矿产地质调查(12120114009001)”和“青海省北巴颜喀拉山地区1∶5万下仓界(I47E010014)、侧不地(I47E011014)幅区域地质矿产调查(DD20208003)”联合资助。 |
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| 中文摘要: |
| 清水河组是巴颜喀拉山地区中生界沉积地层之一。本文在前人研究基础上,通过对清水河组碎屑岩岩石学、岩石地球化学、U-Pb锆石测年分析,对清水河组沉积时代、构造环境及物源进行了探讨。清水河组物源区大地构造背景为活动大陆边缘和大陆岛弧。昆仑地块—西秦岭地块大陆弧为清水河组主要物源之一,碎屑物质来自上地壳的长英质火山岩源区。清水河组碎屑锆石U-Pb锆石年龄主要集中在晚古生代260 Ma和288 Ma、早古生代444 Ma、新元古代850 Ma和960 Ma、中元古代1300 Ma。海西期—印支期以及加里东期岩浆岩是本区碎屑锆石的主要来源。 |
| 英文摘要: |
| The Qingshuihe formation is one of the Mesozoic sedimentary strata in the Bayan Har Mountain area. On the basis of previous studies, the Qingshuihe formation’s sedimentary age, tectonic environment and provenance were discussed through the analysis of the Qingshuihe formation’s clastic rock petrology, petrogeochemistry, and U-Pb zircon dating. The geotectonic background of the source area of the Qingshuihe formation is an active continental margin and a continental arc. The Kunlun Block-West Qinling Block continental arc is one of main sources of the Qingshuihe formation, and the detrital material came from the felsic volcanic rock of the upper crust. Ages of detrital zircon U-Pb from the Qingshuihe formation are mainly concentrated in the Late Paleozoic (260 Ma and 288 Ma), Early Paleozoic (444 Ma), Neo-Proterozoic (850 Ma and 960 Ma) and Mesoproterozoic (1300 Ma). The Hercynian-Indosinian and Caledonian magmatic activities are the main sources of detrital zircons in this area. |
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