辽东五龙金矿围岩片麻状花岗岩的侵位和变形时代:SHRIMP U-Pb年代学制约

杨凤超; 杨佳林; 顾玉超; 沈鑫

doi:10.12090/j.issn.1006-6616.2019.25.S1.008

辽东五龙金矿围岩片麻状花岗岩的侵位和变形时代:SHRIMP U-Pb年代学制约

doi: 10.12090/j.issn.1006-6616.2019.25.S1.008

中国地质调查局沈阳地质调查中心, 辽宁沈阳 110034

基金项目:

国家重点研发计划 2016YFC0600108

中国地质调查局地质调查项目 DD20160049

详细信息

作者简介:
杨凤超, (1982-), 男, 高级工程师, 主要从事矿产预测及研究工作。E-mail:yangfc123@163.com

中图分类号: P618.51
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出版历程
- 刊出日期: 2019-05-01

EMPLACEMENT AND DEFORMATION AGE OF SURROUNDING GNEISSIC GRANITE IN WULONG GOLD DEPOSIT, EASTERN LIAONING PROVINCE: SHRIMP U-PB AGE

Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Shenyang 110034, Liaoning, China

摘要

摘要: 为了确定五龙金矿围岩的侵位和变形时代，进一步探讨辽东地区晚中生代构造体制转折时限，采用岩相学观察和锆石SHRIMP U-Pb定年技术，对辽东五龙大型金矿的围岩五龙岩体、侵入五龙岩体中的花岗斑岩脉和三股流岩体进行了研究。结果表明，五龙岩体具弱片麻状、片麻状构造，花岗斑岩脉也发生了变形作用，三股流岩体未发生变形作用。五龙岩体SHRIMP U-Pb年龄为（159.2±1.9）Ma和（160.0±1.4）Ma，花岗斑岩SHRIMP U-Pb年龄为（132.14±0.85）Ma，三股流岩体SHRIMP U-Pb年龄为122~124 Ma。辽东五龙岩体经历的推覆、挤压事件止于132~124 Ma。辽东地区晚侏罗世的推覆、挤压事件与古太平洋板块向欧亚大陆俯冲作用关系密切，五龙金矿的成矿大地构造背景亦与此次俯冲有关。
- 辽东半岛 /
- 五龙金矿 /
- 晚侏罗世 /
- 变形时代 /
- SHRIMP U-Pb
Abstract: In order to determine the emplacement and deformation age of the surrounding rocks of the Wulong gold deposit and further explore the transition period of Late Mesozoic tectonic regime in eastern Liaoning, using petrographic observation and zircon SHRIMP U-Pb dating techniques, the Wulong rock mass around the Wulong gold deposit in eastern Liaoning, the intrusive granulite porphyry veins in the Wulong rock mass, and the Sanguliu rock mass were studied. The results show that the Wulong rock mass is a typical rock with a weak gneissic, gneissic structure, the granitic porphyry veins, which have been invaded, have also been deformed, and the Sanguliu rock mass is not deformed. The Wulong rock mass SHRIMP U-Pb age is 159.2±1.9 Ma and 160.0±1.4Ma, granite porphyry is 132.14±0.85 Ma and the Sanguliu rock mass is 122-124 Ma. The Liaodong Wulong rock mass experienced the push, the extrusion event ending at 132-124 Ma. The overburden and squeeze events of the Late Jurassic in Liaodong area are closely related to the subduction of the ancient Pacific plate to Eurasia. The metallogenic tectonic setting of the Wulong gold deposit is also related to this subduction.
- Liaodong Peninsula /
- Wulong gold deposit /
- Jurassic /
- deformation age /
- SHRIMP U-Pb

HTML全文

图 1 辽东五龙岩体及其脉岩的不同岩石照片

a、b、c、d、e、f—二长花岗岩；g、h、i—花岗斑岩；a、d、g—岩石标本照片；b、e、h—显微镜下单偏光照片(25×)；c、f、i—显微镜下正交偏光照片(25×)；Qz—石英；Pl—斜长石；Pe—条纹长石；Mic—微斜长石；Bit—黑云母

Figure 1. Different rock images of the Wulong rock mass and its veins in eastern Liaoning

下载: 全尺寸图片幻灯片

图 2 辽东五龙岩体SHRIMP U-Pb年龄

Figure 2. SHRIMP U-Pb age of the Wulong rock mass in eastern Liaoning

下载: 全尺寸图片幻灯片

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