Title: SHRIMP zircon U-Pb dating and geochemical characteristics of Laojunshan granite intrusion from the Wazha tungsten deposit,Yunnan Province and their implications for petrogenesis
Abstract: The Wazha tungsten deposit in Yunnan Province is located in the northeast contact zone of Laojunshan granite intrusion and belongs to the southeastern Yunnan-western Guangxi tungsten-tin polymetallic metallogenic area in Cretaceous age. The tungsten deposit displays close temporal and genetic relationship with the granites occurring in the Wazha tungsten ore district,which are recognized to be the first phase of Laojunshan granites-medium-coarse two mica monzonitic granites. In this paper we applied SHRIMP zircon U-Pb dating and major,trace and rare earth element analysis to the granites,in order to clarify the rock-forming age,dynamic background,source rocks and formation temperature and pressure of the granites. The granites are high-K calc-alkaline series and are proposed to be strongly-peraluminous S-type granites. The crystallization age of the intrusion was determined to be 83.3±1.5Ma. They may emplaced within the lithospheric extensional period and Were derived from the remelt of clay-enriched argillaceous rocks. The formation temperature of granite magma was from 875℃ to 900℃,the estimated pressure was about 7×108 pa,indicating that they were formed at depth of 26km.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 14
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