Geochronology And Geochemical Of Ziyunshan Pluton At Yuhuashan Area In Jiangxi And Its Geological Significance

Granite, the product of the growth of the mainland, is an important part of the continental crustand is closely related to many mineral. So it help people to understand the evolution of the earthinformation through the study of granite. Located in central of Jiangxi Province,Ziyunshanyangranite is situated east of Qinhang polymetallic metallogenic belt and the southern part of GanHang uranium mineralization. Previous research of rock-forming and ore-froming are moreconcentrated in the Nanling region，however，the research of rock-forming and ore-froming incentral of Jiangxi Province is relatively weak. Many deposits are surrounded around the pluton,the north side of Xu Shan large tungsten copper deposit, the eastern side of Xiangyuan tungstenmine, southwest the Quyuan granite uranium deposit and molybdenum mineralization belt foundin the south-east corner of the pluton recently. These deposits are closely related to the Ziyunshanrock mass, however, so far, the lack of precise chronology of the rock mass, and so many otheraspects of geological and geochemical information. So I selected Ziyunshan granite for the study,and then on the study of basis of its formation age and geochemical characteristics of the rockmass, I will explore the diagenetic material sources, tectonic environment, thus at last achieve thepurpose of preliminary exploration of its relationship with the regional metallogenic. The mainresults are as follows:1. Through the LA-ICP-MS zircon of the Jiaoken、Miaoqian、Yaoli unit，Ziyunshan plutonis formed143-155Ma，the Late Jurassic，the case of early Yanshanian. Such a long time ofcrystallization, the rock mass is related to high power granite.2. Through the element geochemistry, Ziyunshan pluton is rich in Si, K, Al major elements,as well as U, Th, K thermal elements; relatively poor in Ca, Na, P, Fe, Mg major elements,as well as Ba, Sr, P, Ti trace elements. The high A/CNK can show the pluton isperaluminous granite, relates to Al-rich minerals,such as muscovite and corundummolecules in the rock.All the REE element and trace elements have the same trend andcurve shape, confirmed the conclusions of the previous its named “Ziyunshan super unit”,each unit is the product of the evolution of the same magma. The strongly Eu negative anomalies indicates magma experienced a higher degree of evolution.3. Through Petrography petrology, mineralogy, mining, major elements, trace elements andelements belong to the S-type granites that Ziyunshan rock mass, the equivalent of crustaltransformation-type granites, substances derived from higher maturityin the upper crust,the source area metasediments, mixed with a small amount of argillaceous rocks. Rockformation in extensional environment, from extrusion to stretch.4. With so much U mineralization alteration, it indicates the prospect of U deposit inZiyunshan pluton.Through the contrast of rock-forming and ore-froming betweenZiyunshan and Nanling. Ziyunshan rock-forming and ore-froming are from the samemagma system, and the pluton provides material、 heat and hydrothermal for W、Mo、Cu Mineralization.