南秦岭佛坪片麻岩穹隆变质作用及与岩浆作用的关系

陈龙耀; 刘志慧; 刘晓春; 刘树文

doi:10.3799/dqkx.2019.236

南秦岭佛坪片麻岩穹隆变质作用及与岩浆作用的关系

doi: 10.3799/dqkx.2019.236

1.
中国地质科学院地质力学研究所, 北京 100081
2.
河北环境工程学院环境科学系, 河北秦皇岛 066102
3.
北京大学地球与空间科学学院, 北京 100871

基金项目:

国家重大基础研究发展规划项目 2015CB856104

国家自然科学基金项目 41872059

详细信息

作者简介:
陈龙耀(1988—), 男, 助理研究员, 博士, 主要从事变质岩石学研究

中图分类号: P581;P586
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- 被引次数: 0
出版历程
- 收稿日期: 2019-08-25
- 刊出日期: 2019-12-15

Metamorphism and Its Relation of Magmatism of the Foping Gneiss Dome in the South Qinling Tectonic Belt

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Department of Environmental Sciences, Hebei University of Enviromental Engineering, Qinghuangdao 066102, China
3.
School of Earth and Space Sciences, Peking University, Beijing 100871, China

摘要

摘要: 南秦岭佛坪片麻岩穹隆是国内片麻岩穹隆的典型代表之一，记录了碰撞造山到后造山伸展等多阶段构造演化信息，对揭示秦岭造山带早中生代构造演化具有重要的意义.岩石组合、岩相学、矿物化学和传统温压计研究表明，佛坪片麻岩穹隆具有明显的变质分带特征，以穹隆核部为中心，向南北两侧的盖层变质温度逐渐降低，压力并没有出现随地温梯度的相应变化.不同类型岩石的锆石LA-ICP-MS U-Pb定年和变泥质岩的独居石SHRIMP U-Pb定年给出了一致的变质时代，为206~196 Ma.结合南秦岭早中生代岩浆作用研究，认为佛坪片麻岩穹隆递增变质作用与三叠纪末期的岩浆底辟有关，片麻岩穹隆形成于后碰撞伸展环境.
- 南秦岭构造带 /
- 佛坪 /
- 片麻岩穹隆 /
- 变质分带 /
- 岩石学
Abstract: The Foping gneiss dome in the South Qinling tectonic belt is one of the most typical gneiss domes. The gneiss dome has records the multi-stage tectonic evolution from syn-collision orogeny to post-orogenic extension, and therefore is critical to understanding the Early Mesozoic tectonic evolution of the Qinling orogen. The studies on field work, petrography, mineral chemistry, and conventional geothermobarometry show that Foping gneiss dome has typical metamorphic zoning, with metamorphic temperature gradually decreasing from the Precambrian basement in the core to the sedimentary covers in the north and south flanks. Zircon LA-ICP-MS U-Pb dating of different types of rocks and monazite SHRIMP U-Pb dating of the metapelites give a consistent metamorphic age of ca. 206-196 Ma. In combination with the investigation of Early Mesozoic granitoids in the South Qinling tectonic belt, the authors infer that the metamorphism of the Foping gneiss dome was induced by Late Triassic magmatic diapir in a post-collisional extensional setting.
- South Qinling tectonic belt /
- Foping /
- gneiss dome /
- progressive metamorphic zone /
- petrology

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图 1 秦岭造山带大地构造简图(a)与佛坪地区地质简图(b)

a据Dong et al.(2011)修改；b据陕西省地质矿产局(1999)

Fig. 1. Geological sketch map of the Qinling orogen (a); simplified geological map of the Foping area (b)

下载: 全尺寸图片幻灯片

图 2 佛坪片麻岩穹隆成因模式图

a据Hu et al.(2018)

Fig. 2. Schematic diagram showing the formation of the Foping gneiss dome

下载: 全尺寸图片幻灯片

表 1 佛坪片麻岩穹隆地层时代划分及同位素年代学结果

Table 1. Geochronological data and stratigraphic classification of the Foping gneiss dome

位置	单元	地层格架重建 (刘志慧等，2018)	样品号	岩性	锆石(Ma) (刘志慧等，2019)	独居石(Ma) (笔者未发表数据)
外围盖层	晚古生代盖层	泥盆-石炭系	YX09C7	变泥质岩		203 ± 2
外围盖层	晚古生代盖层	泥盆-石炭系	YX17C3	变泥质岩		199 ± 2
穹隆盖层	长角坝岩群	泥盆系	FP14C3	变泥质岩		204 ± 2
			YX02C3	同变形花岗岩	206~202
			YX05C1	变泥质岩		203 ± 1
穹隆核部	龙草坪片麻岩套	泥盆系	FP02C2	混合岩淡色体	204 ± 2
	龙草坪片麻岩套	中元古代-新元古代基底	FP07C2	伟晶岩脉	201 ± 2
	佛坪岩群		FP19C8	二辉麻粒岩	202 ± 7
			FP24C5	变泥质岩	196 ± 2	197 ± 2
			FP26C3	变泥质岩	198 ± 2	205 ± 1

下载: 导出CSV

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