DOI:10.19762/j.cnki.dizhixuebao.2021114
 
The source material for a new type of polyhalite potassium ore in the Puguang area, northeast Sichuan:evidence from Sr and S isotopes
Author NameAffiliationE-mail
SHANG Wenjun 1) Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037
2) Key Laboratory of Salt Lake Resources and Environment, Ministry of Natural Resources, Beijing, 100037
3) Key Laboratory of Metallogeny and Resource Evaluation, Ministry of Natural Resources, Beijing, 100037 
swjun26@126.com 
ZHANG Yongsheng 1) Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037
2) Key Laboratory of Salt Lake Resources and Environment, Ministry of Natural Resources, Beijing, 100037
3) Key Laboratory of Metallogeny and Resource Evaluation, Ministry of Natural Resources, Beijing, 100037 
zys_601@126.com 
XING Enyuan 1) Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037
2) Key Laboratory of Salt Lake Resources and Environment, Ministry of Natural Resources, Beijing, 100037
3) Key Laboratory of Metallogeny and Resource Evaluation, Ministry of Natural Resources, Beijing, 100037 
 
PENG Yuan 1) Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037
2) Key Laboratory of Salt Lake Resources and Environment, Ministry of Natural Resources, Beijing, 100037
3) Key Laboratory of Metallogeny and Resource Evaluation, Ministry of Natural Resources, Beijing, 100037 
 
GUI Baoling 1) Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037
2) Key Laboratory of Salt Lake Resources and Environment, Ministry of Natural Resources, Beijing, 100037
3) Key Laboratory of Metallogeny and Resource Evaluation, Ministry of Natural Resources, Beijing, 100037 
 
LI Kong 4) Xi’an Center of Mineral Resources Survey, China Geological Survey, Xi’an, 710199  
JI Debao 5) Institute of Geology and Mineral Resources, Sichuan Bureau of Geology and Mineral Exploration and Development, Chengdu, 610036  
Abstract:A new type of polyhalite potassium ore, characterized by the distribution of clastic polyhalite in the halite, is located in the marine evaporite of the lower Triassic Jialingjiang Formation and the Middle Triassic Leikoupo Formation in the Puguang area of Northeast Sichuan. In order to study its source materialand to provide a reference for such research in the future, the strontium and sulfur isotopic techniques are applied to the polyhalite, and the experimental results are compared with the gypsum and mungbean rocks in the Sichuan Basin. The results show that except for the high δ34 S and 87 Sr/ 86 Sr values of clay rich anhydrite samples, the δ34 S and 87 Sr/ 86 Sr characteristics of the new type of detrital polyhalite and its bottom anhydrite samples are similar. The δ34 S are 27. 9‰~28. 9‰ and 87 Sr/ 86 Sr are 0. 70826~0. 70829, respectively, which are homologous, and similar to the δ34 S characteristics of global marine sulfate and 87 Sr/86 Sr composition of global seawater in the same period. Therefore, its material source is seawater of the same period. The determination of its provenance has undoubtedly narrowed the scope of discussion of the metallogenic model and provides a framework for future research.
keywords:new type of polyhalite potassium ore  strontium isotope  sulfur isotope  source of ore substances  Puguang area
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