Geochemical Characteristics，Zircon U-Pb Age and Geochronological Significance of Diabase in Heiniu’ao Gold Deposit，Baoshan Block，Western Yunnan
Received date: 2019-07-08
Revised date: 2019-10-08
Online published: 2020-02-26
The special geotectonic location of Baoshan block makes it undergo a series of Tethys evolutionary activities with frequent regional tectonic-magmatic activities.Granite is developed from Paleozoic to Cenozoic.In addition，a large number of basic intrusive rocks occurring as dikes and dikes are also developed in the region.Previous research and analysis of granite in the region is relatively systematic，but the study and analysis of basic rocks in the region，especially basic dikes commonly developed in typical polymetallic ore areas in the ore concentration area，is relatively weak.Previous studies and analyses only the chronology of diabase and its relationship with mineralization in the Hetaoping lead-zinc polymetallic ore area.The study and analysis of the petrogenesis of basic rocks is almost blank.Therefore，the diabase porphyrite in typical boreholes of Heiniu’ao gold deposit has been systematically analyzed in terms of petrochemical characteristics and zircon U-Pb dating in LA-ICP-MS in situ.The main elements of Heiniu’ao diabase porphyry are characterized by low SiO2，low TiO2，high Al2O3，low MgO，high FeOT and low K2O，belonging to the shoshonite series.Trace and rare earth elements are characterized by enrichment of light rare earth elements （LREE） and large ion lithophile elements （LILE） and depletion of high field strength elements（HFSE），suggesting that their source areas are lithospheric mantle.The content of Cr and Ni in the rocks is obviously lower than that in the original basalt magma，indicating that the magma may have undergone the crystallization separation of olivine and pyroxene.The obvious negative anomalies of Nb and Ta suggest that they were contaminated by crustal materials during the process of magma emplacement.The tectonic environment is consistent with the tectonic background of Jinchanghe diabase and Hetaoping diabase，which are intraplate extensional environments.The diagenetic age of the diabase porphyrite obtained in the mining area is （212.0±4.9） Ma，which is similar to the diagenetic age of the Hetaoping diabase obtained by predecessors （195.0±5.3） Ma，and that of the Jinchanghe diabase （217.3±5.8） Ma are all Late Triassic.It shows that the basic dikes in the area are the products of the Triassic magmatic activities.The closure of the Triassic Paleo-Tethyan Ocean resulted in the collision between Baoshan and Simao blocks，which resulted in extensional activities in Baoshan block.The basalt magma originating from the mantle emplaced upward along the weak tectonic zone to form diabase porphyrite of this time limit，and experienced crystallization differentiation and crustal contamination during the process of magma emplacement.
Ying LUO , Yingxiang LU , Xuelong LIU , Shunrong XUE , Shuaishuai WANG , Zhenhuan LI , Changzhen ZHANG , Jianhang CHEN . Geochemical Characteristics，Zircon U-Pb Age and Geochronological Significance of Diabase in Heiniu’ao Gold Deposit，Baoshan Block，Western Yunnan[J]. Gold Science and Technology, 2020 , 28(1) : 1 -11 . DOI: 10.11872/j.issn.1005-2518.2020.01.128
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