Detrital zircon geochronology of Cambrian—Ordovician sedimentary rocks in southern Hunan—Northeast Guangxi area and its tectonic implications

ZHANG Xiong; ZENG Zuo-xun; LIUWei; PAN Li-li; YANG Bao-zhong; LIU Jian-xiong; WEI Yun-xu; HE Chi-cheng; LI Shao-fan

doi:10.12029/gc20160112

2016 Vol. 43, No. 1

Article Contents

Article navigation > Geology in China > 2016 > (1): 153-173

Next Article Previous Article

ZHANG Xiong, ZENG Zuo-xun, LIUWei, PAN Li-li, YANG Bao-zhong, LIU Jian-xiong, WEI Yun-xu, HE Chi-cheng, LI Shao-fan. Detrital zircon geochronology of Cambrian—Ordovician sedimentary rocks in southern Hunan—Northeast Guangxi area and its tectonic implications[J]. Geology in China, 2016, (1): 153-173. doi: 10.12029/gc20160112

Citation:

ZHANG Xiong, ZENG Zuo-xun, LIUWei, PAN Li-li, YANG Bao-zhong, LIU Jian-xiong, WEI Yun-xu, HE Chi-cheng, LI Shao-fan. Detrital zircon geochronology of Cambrian—Ordovician sedimentary rocks in southern Hunan—Northeast Guangxi area and its tectonic implications[J]. Geology in China, 2016, (1): 153-173. doi: 10.12029/gc20160112

Detrital zircon geochronology of Cambrian—Ordovician sedimentary rocks in southern Hunan—Northeast Guangxi area and its tectonic implications

1.
Huazhong Tectonomechanical Research Center, Faulty of Earth Sciences, China University of Geosciences(Wuhan);Chongqing Institute of Geology and Mineral Resources, Chongqing 400042 China
2.
Huazhong Tectonomechanical Research Center, Faulty of Earth Sciences, China University of Geosciences(Wuhan)
3.
Guangdong Foshan Geological Survey, Foshan 528000, Guangdong, China
4.
Wuhan Center of Geological Survey, China Geological Survey. Wuhan 430223, Hubei, China

Received Date: 29 December 2014

Revised Date: 16 March 2015

Publish Date: 24 February 2016

Abstract

Abstract

In this paper, the authors studied detrital zircon geochronology of the Cambrian-Ordovician sedimentary rocks sampled from the southern Hunan to northeastern Guangxi area by using LA-ICP-MS and obtained 239 groups of effective age data, with the ages ranging from 3146 Ma to 474 Ma. Most of the data are concentrated in five periods, i.e., 2633-2473 Ma (peak value around 2500 Ma), 1880-1521 Ma (peak value around 1650 Ma), 1146-911 Ma (peak value around 970 Ma), 896-720 Ma (peak value around 800 Ma) and 682-474 Ma (peak value around 520 Ma). All the four samples recorded Paleoarchean-Mesoarchean information, and their ages are concentrated on 1146-911 Ma and 896-848 Ma, suggesting that the Grenville and Rodinia orogeny events profoundly influenced the study area. Moreover, the authors obtained a large number of ages representing the Pan-African time, implying that the global Pan-African event significantly affected the Cathaysia Block and its adjacent regions. Combined with previous researches, the authors hold that the study area is located in the southeast of the southwestern section of the collision orogenic belt between the Yangtze block and the Cathaysia block. The strata in the study area received material sources from the two blocks with the material from the Cathaysia block being dominant.
- U-Th-Pb isotopic compositions of detrital zircons /
- Yangtze block /
- Cathaysia block /
- southern Hunan- northeast Guangxi