SIMS Zircon U-Pb Age of a Rhyolite Layer from the Halahatang Area, Northern Tarim, NW China: Constraint on the Eruption Age of Major Pulse of Tarim Flood Basalt

Acta Scientiarum Naturalium Universitatis Pekinensis

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SIMS Zircon U-Pb Age of a Rhyolite Layer from the Halahatang Area, Northern Tarim, NW China: Constraint on the Eruption Age of Major Pulse of Tarim Flood Basalt

SHANGGUAN Shimai¹, TIAN Wei¹, LI Xianhua², GUAN Ping¹, PAN Mao¹, CHEN Mimi¹, PAN Wenqing³

1. Key Laboratory of Orogenic Belts and Crustal Evolution MOE; School of Earth and Space Sciences, Peking University, Beijing 100871; 2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijng 100029; 3. Institute of Petroleum Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000;

Received:2011-01-24 Online:2011-05-20 Published:2011-05-20

塔北哈拉哈塘流纹岩的离子探针锆石U-Pb 年代学: 对塔里木溢流玄武岩主期喷发时代的约束

上官时迈¹, 田伟¹,李献华², 关平¹, 潘懋¹, 陈咪咪¹, 潘文庆³

1. 北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871; 2. 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京100029; 3. 中国石油天然气股份有限公司塔里木油田分公司勘探开发研究院, 库尔勒 841000;

Abstract

Abstract: Seismological interpretation revealed that basalts are overlain by rhyolite in the Halahatang area, Northern Tarim, Northwest China. The overlying rhyolite is dated by SIMS zircon U-Pb method, yielding a precise concordia age of 287.3 ±2.0 Ma, which limits the latest eruption age of the underlying basalt and reveals that the eruption age of the main pulse of the Tarim flood basalt is before 287 Ma, not ~275 Ma.

Key words: Tarim, flood basalt, large igneous province (LIP), rhyolite, zircon U-Pb age

摘要： 塔里木北部哈拉哈塘地区存在流纹岩覆盖于玄武岩之上的迭置关系。对上层流纹岩采用SIMS锆石U-Pb 法精确测定其年龄为 287.3 ±2.0 Ma。该年龄限定该区玄武岩的喷发时代不晚于 287 Ma,证明塔里木溢流玄武岩的主喷发期应不晚于 287 Ma,而非前人提出的大约 275 Ma。

关键词: 塔里木, 溢流玄武岩, 大火成岩省, 流纹岩, 锆石U-Pb年代学

CLC Number:

P597

SHANGGUAN Shimai,TIAN Wei,LI Xianhua,GUAN Ping,PAN Mao,CHEN Mimi,PAN Wenqing. SIMS Zircon U-Pb Age of a Rhyolite Layer from the Halahatang Area, Northern Tarim, NW China: Constraint on the Eruption Age of Major Pulse of Tarim Flood Basalt[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

上官时迈, 田伟,李献华, 关平, 潘懋, 陈咪咪, 潘文庆. 塔北哈拉哈塘流纹岩的离子探针锆石U-Pb 年代学: 对塔里木溢流玄武岩主期喷发时代的约束[J]. 北京大学学报（自然科学版）.

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SIMS Zircon U-Pb Age of a Rhyolite Layer from the Halahatang Area, Northern Tarim, NW China: Constraint on the Eruption Age of Major Pulse of Tarim Flood Basalt

塔北哈拉哈塘流纹岩的离子探针锆石U-Pb 年代学: 对塔里木溢流玄武岩主期喷发时代的约束

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