西昆仑新藏公路北段古-中生代多期次构造-热事件年龄确定

计文化; 周辉; 李荣社; 陈守建; 赵振明

西昆仑新藏公路北段古-中生代多期次构造-热事件年龄确定

1.
西安地质矿产研究所, 陕西西安 710054
2.
北京大学地质系, 北京 100871

基金项目:

国家自然科学基金项目 49902020

青藏高原前寒武纪地质、古生代构造-岩相古地理综合研究项目部分成果 1212010610102

详细信息

作者简介:
计文化(1968 -), 男, 高级工程师, 主要从事区域地质研究. E-mail: jiwenhua1968@126.com

中图分类号: P548
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- 被引次数: 0
出版历程
- 收稿日期: 2007-06-16
- 刊出日期: 2007-09-25

The Deformation Age of Palaeozoic-Mesozoic Tectonic along North Xin-Zang Road in West Kunlun

1.
Xi′an Institute of Geology and Mineral Resources, Xi′an 710054, China
2.
Geological Department, Beijing University, Beijing 100871, China

摘要

摘要: 为了建立西昆仑地区构造-热事件序列, 利用⁴⁰Ar/³⁹Ar同位素分析法对西昆仑新藏公路康西瓦断裂带以北具有代表性的同构造新生变质矿物角闪石、黑云母、绢云母单矿物进行了年龄测定, 得到几个多次出现的年龄值.结合早期该区发育的各类岩脉的侵位年龄综合分析, 认为片麻岩中单矿物黑云母440Ma和(403±6) Ma⁴⁰Ar/³⁹Ar年龄, 可代表早古生代俯冲变质年龄以及增生过程所持续的时间; 片岩、片麻岩中黑云母, 斜长角闪片岩(基性岩脉) 中单矿物角闪石的⁴⁰Ar/³⁹Ar年龄为382Ma~84Ma, 代表着该区从早古生代晚期的挤压构造环境转化为引张环境及其所持续的时间; 晚期脆性断裂中云母类矿物178Ma~65Ma的⁴⁰Ar/³⁹Ar年龄, 代表着该区在挤压走滑构造背景中断裂构造的脉冲式活动及其持续时间.
- ⁴⁰Ar/³⁹Ar定年 /
- 古生代 /
- 俯冲增生作用 /
- /
- 西昆仑
Abstract: To establish the list of tectonic-metamorphic events in West Kunlun, we have dated tectonic metamorphic minerals such as amphibole, biotite and didrimit through ⁴⁰Ar-³⁹Ar isotopic analysis. We have gained several ages that occur many times. Combined with the emplacement age of dikes developed in this area earlier, the 440 Ma and (403±6) Ma ⁴⁰Ar∕³⁹Ar age of individual mineral biotite in gneiss can represent early Paleozoic underthrut curdle age and the period of accretional process; 382 Ma-284 Ma age of individual mineral biotite in schiefer gneiss and individual mineral amphibole in amphibolite-schist can represent the changing environment from extrusion to spread of this area in early Paleozoic era; 178 Ma-165 Ma ⁴⁰Ar∕³⁹Ar age of biotite in fragile fault can represent the spurt action of fault tectonic in the background of extrusion strike-slip tectonic and its duration.
- ⁴⁰Ar-³⁹Ar dating /
- Paleozoic /
- subduction-accretion process /
- Tethys /
- West Kunlun

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图 1 阿喀孜—麻扎地质略图

1.新生代沉积; 2.三叠纪花岗岩; 3.早古生代中酸性侵入体; 4.断裂边界; 5.沉积地层边界; 6.侵入边界; 7.片麻状侵入体边界; 8.采样点及编号; 9.新藏公路、地点; 10.不同时代地层; 11.①黑云母花岗岩; ②片麻岩; ③花岗质片麻岩; ④片岩; ⑤库地蛇绿岩; ⑥花岗闪长岩; ⑦片岩; ⑧一些克沟火山岩; ⑨闪长岩; ⑩大理岩、片岩

Fig. 1. Geological outline of Akarzi-Mazar

下载: 全尺寸图片幻灯片

图 2 库地达坂-赛力亚克达坂地质构造剖面图

①, ②, ……⑩同图 1

Fig. 2. The geological section from Kuda to Serike ghat

下载: 全尺寸图片幻灯片

图 3 库地南片麻岩中构造变形特征

a.新藏公路173 km处犁式断裂; b.新藏公路175 km处片理构造

Fig. 3. Deformation characteristics of the gneiss in the South of Kuda

下载: 全尺寸图片幻灯片

图 4 黑云母、角闪石的⁴⁰Ar/³⁹Ar坪年龄

Fig. 4. ⁴⁰Ar/³⁹Ar age of biotite and amphibole

下载: 全尺寸图片幻灯片

表 1 黑云母、角闪石⁴⁰Ar/³⁹Ar快中子活化法定年数据

Table 1. The⁴⁰Ar/³⁹Ar dating data of biotite and amphibole in NA fast neutron activation method

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