|Table of Contents|

Discovery and Geological Significance of Siliceous Rocks in Beizhan Iron Deposit, the Western Tianshan of Xinjiang, China(PDF)

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

Issue:
2021年第05期
Page:
785-799
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Discovery and Geological Significance of Siliceous Rocks in Beizhan Iron Deposit, the Western Tianshan of Xinjiang, China
Author(s):
PAN Hong-di1 SHEN Ping23 LI Chang-hao23 FENG Hao-xuan23 WU Yang23 GUO Xin-cheng4 ZHANG Jian-shou4
(1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 4. The Eleven Geological Branch, Xinjiang Bureau of Geo-exploration and Mineral Development, Changji 831100, Xinjiang, China)
Keywords:
siliceous rock petrography lithogeochemistry volcanic-sedimentary genesis siliceous source tectonic setting sedimentary environment Xinjiang
PACS:
P581
DOI:
10.19814/j.jese.2021.06029
Abstract:
The volcanic and sedimentary rocks of the third sub-group of Lower Carboniferous Dahalajunshan Formation outcrop in Beizhan iron deposit, the western Tianshan of Xinjiang. The stratiform and bedded siliceous rocks were recognized based on the geological section survey and petrographic study, and developed in the limestones, dacites and tuffs in Beizhan iron deposit. Siliceous rocks with microcrystalline textures and massive and bedded structures are mainly consist of chalcedony and microcrystalline quartz. Siliceous rocks are characterized by high SiO2(67.26%-83.52%), Al2O3(5.85%-15.88%), and TiO2(0.30%-0.68%)contents and Al2O3/(Al2O3+Fe2O3)ratios(0.89-0.99), but low K2O(0.27%-4.09%)and P2O5(0.06%-0.12%)contents and MnO/TiO2 ratios(0.02-0.13). The total contents of REE of siliceous rocks are high((11.32-119.14)×10-6), and the chondrite-normalized REE patterns are characterized by enriched in LREE and depleted in HREE. The petrography and lithogeochemical characteristics show that siliceous rocks in Beizhan iron mining area are volcanic-sedimentary genesis, and they derive from submarine volcanic eruption with minor terrestrial clastic materials input; siliceous rocks form in a continental margin setting with shallow marine, weakly alkaline and oxidized conditions, which are favourable for the formation of magnetite. Therefore, the discovery of siliceous rocks is important for recognizing the tectonic setting, formation condition, and genesis of Bizhan iron deposit.

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