Chronology and geological significance of spillite-keratophyre in Pingshui Formation, northwest Zhejiang Province

CHEN Hui; NI Pei; CHEN Ren-yi; LV Zhi-cheng; PANG Zhen-shan; WANG Guo-guang; YUAN Hui-xiang

doi:10.12029/gc20160204

2016 Vol. 43, No. 2

Article Contents

Article navigation > Geology in China > 2016 > (2): 410-418

Next Article Previous Article

CHEN Hui, NI Pei, CHEN Ren-yi, LV Zhi-cheng, PANG Zhen-shan, WANG Guo-guang, YUAN Hui-xiang. Chronology and geological significance of spillite-keratophyre in Pingshui Formation, northwest Zhejiang Province[J]. Geology in China, 2016, (2): 410-418. doi: 10.12029/gc20160204

Citation:

CHEN Hui, NI Pei, CHEN Ren-yi, LV Zhi-cheng, PANG Zhen-shan, WANG Guo-guang, YUAN Hui-xiang. Chronology and geological significance of spillite-keratophyre in Pingshui Formation, northwest Zhejiang Province[J]. Geology in China, 2016, (2): 410-418. doi: 10.12029/gc20160204

Chronology and geological significance of spillite-keratophyre in Pingshui Formation, northwest Zhejiang Province

1.
Development and Research Center, China Geological Survey, Beijing 100037, China;School of Earth Sciences and Resources, China University of Geosciences Beijing, Beijing 100083, China;Technical Guidance Center for Mineral Resources Exploration, Ministry of Land and Resources, Beijing 100120, China
2.
State Key Laboratory for Mineral Deposits Research, Institute of Geo-fluids, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China
3.
Development and Research Center, China Geological Survey, Beijing 100037, China;Technical Guidance Center for Mineral Resources Exploration, Ministry of Land and Resources, Beijing 100120, China

Received Date: 02 November 2015

Revised Date: 20 January 2016

Publish Date: 24 April 2016

Abstract

Abstract

This paper reports LA-ICP-MS zircon U-Pb ages of spillite-keratophyre in Pingshui Formation, northwest Zhejiang Province. The Th/U ratios in the range of 0.42-2.28 show that the zircon is a typical magmatic mineral. Analytical results show that the weighted mean ,206Pb/238U age of the spillite is (952±5) Ma (n=18, MSWD=0.19), and that of the keratophyre is (954±8) Ma (n=15, MSWD=0.51). Combined with previous studies and geological facts, the authors hold that the diagenetic epoch of the spillitekeratophyre in the Pingshui Formation was the Neoproterozoic (about 950 Ma). It is further suggested that the amalgamation between the Yangtze and Cathaysia Blocks in the eastern segment of the Jiangnan orogen was completed between 1.0 Ga and 0.9 Ga. It can be inferred that the Pingshui area and even Qin-Hang metallogenic belt have the potential in search for VMS deposits.
- Pingshui copper deposit /
- spillite-keratophyre /
- LA-ICP-MS /
- Neoproterozoic /
- geological significance