Zircon LA-ICPMS U-Pb dating and geochemical characteristics of Huangshaping granite in southeast Hunan province, China.

There are two types granitoid in the middle of Nanling granitoid zone, including Qianlishan and Qitianling granites and Shuikoushan, Tongshanling and Baoshan granodiorite intrusions. The Huangshaping granite, which is close to the former granites, is characterized by higher values of SiO2 and K2O, higher ratio of K2O/Na2O, high abundances of Rb, Th, U, Ta and Nb, but lower contents of Ba, Sr, P, Eu and Ti. Chondrite-normalized REE patterns show strong negative Eu anomalies. The Huangshaping granite is dated 161. 6 1. 1 Ma by zircon LA-ICPMS U-Pb method, which is in accordance with ages of the Qianlishan(162. 55±3. 25Ma) and Qitianling (161±2Ma) granites. These ages imply a major emplacement period of the Yanshanian granites in southeast Hunan province as well as the whole Nanling Range area. In this study, the geochemical and geochronological characteristics are similar between Huangshaping granite and the Qianlishan and Qitianling granites. They are the same type granitoid. Their lithogenesis was related to the lithospheric extension after the Indosinian Orogenesis, and formed from partial melting of the crust material. All this are different from granodiorite intrusions in Shuikoushan, Tongshanling and Baoshan.