|Table of Contents|

Identification of 2 .5 Ga Detrital Zircons from Conjoint Area Between Qilian-Qinling Orogenic Belts and Its Geological Implication(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2007年第02期
Page:
111-116
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Identification of 2 .5 Ga Detrital Zircons from Conjoint Area Between Qilian-Qinling Orogenic Belts and Its Geological Implication
Author(s):
PEI Xian-zhi1MENG Yong12DING Sa-ping1LI Zuo-chen1 LIU Zhan-qing1LIU Hui-bin1LI Gao-yang 1LI Rui-bao1
1. School of Earth Sciences and Resources, Changan University, Xian 710054,Shaanxi, China; 2. Xian Institute of Geology and Mineral Resource, Xian 710054, Shaanxi, China
Keywords:
Newarchaeozoic Era detrital-zircon LA-ICP-MS U-Pb dating with zircon Qilian-Qinling orogenic belt
PACS:
P597
DOI:
-
Abstract:
Through LA-ICP-MS U-Pb dating of a large number of detrital zircon grains from metamorphic sandstones of Huluhe Group in the Huluhe River of the Qinan area, the conjoint area between Qilian and Qinling orogenic belts, 2 302~ 2 578 Ma zircon grains were identified. Their 207Pb/ 206 Pb and 206Pb/ 238 U ages coincide well, and CL images exhibit well-developed oscillatory zoning and the Th/ U ratios are within 0.11~ 1.42, implying that they are tectonomagmatic zircons which formed during late Newarchaeozoic. These zircons are the oldest ones discovered in the conjoint area between Qilian and Qinling orogenic belts up to now, which suggests the presence of crust older than high-grade metamorphic Longshan and Qinling groups in the conjoint area between Qilian and Qinling orogenic belts.

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Last Update: 1900-01-01