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Petrogenesis of the Early Cretaceous Tiantangshan A-Type Granite, Cathaysia Block, SE China: Implication for the Tin Mineralization

1
Development and Research Center, China Geological Survey, Beijing 100037, China
2
Technical Guidance Center for Mineral Resources Exploration, Ministry of Natural Resources of the People’s Republic of China, Beijing 100120, China
3
Yunnan Key Laboratory for Palaeobiology, Yunnan University, Kunming 650091, China
4
China Geological Survey, Beijing 100037, China
5
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
6
School of Resource Environment and Earth Science, Yunnan University, Kunming 650091, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(5), 257; https://doi.org/10.3390/min9050257
Received: 14 March 2019 / Revised: 18 April 2019 / Accepted: 24 April 2019 / Published: 29 April 2019
(This article belongs to the Special Issue Polymetallic Metallogenic System)
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Abstract

The newly discovered Tiantangshan tin polymetallic deposit is located in the southeast Nanling Range, Cathaysia block, Southeast China. The tin orebodies are mainly hosted in the greisen and the fractured alteration zones of the tufflava and trachydacite. However, the genetic relationship between the hidden alkali-feldspar granite and volcanic rocks and the tin mineralization remains poorly understood. This paper presents SHRIMP zircon U–Pb dating, whole-rock major and trace element analyses, as well as Nd isotopic data of the trachydacite and alkali-feldspar granite. The SHRIMP zircon U–Pb dating of the alkali-feldspar granite and trachydacite yields weight mean 206Pb/238U ages of 138.4 ± 1.2, and 136.2 ± 1.2 Ma, respectively. These granitic rocks have high levels of SiO2 (64.2–75.4 wt%, mostly > 68 wt%), alkalis (K2O + Na2O > 8.3 wt%), REE (except for Eu), HFSE (Zr + Nb + Ce + Y > 350 ppm) and Ga/Al ratios (10,000 × Ga/Al > 2.6), suggesting that they belong to the A-type granite. According to the high Y/Nb and Yb/Ta ratios, they can be further classified into A1 subtype. Their εNd (T) range from −3.8 to −6.5. They were likely generated by the assimilation-fractional crystallization (AFC) of the coeval oceanic island basalts -like basaltic magma. This study suggests that the A1 type granite is also a potential candidate for the exploration of tin deposits. View Full-Text
Keywords: A-type granite; tin mineralization; Tiantangshan tin polymetallic deposit; SE China A-type granite; tin mineralization; Tiantangshan tin polymetallic deposit; SE China
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Jia, R.-Y.; Wang, G.-C.; Geng, L.; Pang, Z.-S.; Jia, H.-X.; Zhang, Z.-H.; Chen, H.; Liu, Z. Petrogenesis of the Early Cretaceous Tiantangshan A-Type Granite, Cathaysia Block, SE China: Implication for the Tin Mineralization. Minerals 2019, 9, 257.

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