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The Lead Isotope Characteristics and Tracing of Ore‐bearing Porphyry in the Geza metallogenic Belt, Yunnan
Author(s) -
ZHANG Na,
LIU Xuelong
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12374_72
Subject(s) - zhàng , library science , citation , history , china , engineering , computer science , archaeology
Geza island arc is located in the southwest Sanjiang tectonic igneous rock belts, it was a products of GanziLitang oceanic crust diving to Zhongdian Landmasses in late Triassic and the importance of newly discovered copper polymetallic belts in the recent years in China. The regional strong tectonic-magmatic activity throughout the island-arc orogenesis from beginning to the end, the rich mineralization developed in the different times and circumstances of island arc orogenesis, where outputed the superlarge sized Pulang porphyry copper deposits, Xuejiping large sized porphyry copper deposits and Hongshan large sized skarn-porphyry copper polymetallic deposits. Based on the development stage of island arc orogenic, the distribution of intrusive rocks, composition, geochemical characteristics, Geza granits belt can be divided into three belts. Lithogeochemical characteristics shown that the porphyry(porphyrite) and island-arc granite rocks have the same rock series (high-K calc-alkaline) and the same genetic type (I-type granite); these rocks trace elements similar to the granite of island arc, the similarities of porphyry and local acidic volcanic rocks in the main elements. The formation of porphyry and porphyry-related deposits adapted from magmatic hydrothermal which came from the upper mantle and lower crustal. It is because of aggregation, migration, proliferation,and alteration of ore-forming hydrothermal making the porphyry copper mineralization can be achieved.