Sediment-hosted gold deposits are the major type of gold resources in China. Concentrated mostly in the two "Triangle Regons", they are generally hosted in fine-clastic turbidite,hydrothermal chert and marl ...Sediment-hosted gold deposits are the major type of gold resources in China. Concentrated mostly in the two "Triangle Regons", they are generally hosted in fine-clastic turbidite,hydrothermal chert and marl ranging from Cambrian to Triassic in age, structurally controledby domes, anticlines and second-ordered faults. They are similar to the Carlin-type gold deposits in mineral assemblage and geochemical marks, with an element association closely comparable to those of modern springs and submarine hydrothermal sediments. Organic matter mayhave played an important role in mineralization. The ore solution may be hydrothermally altered meteoric water developed in areas of local geothermal anomaly.展开更多
Hydrothermal clay minerals that formed in the main metallogenic stage of the Changkeng disseminated-type gold deposit in central Guangdong were analyzed by the 40Ar/39Ar laser probe. The results give Ar-Ar isochron ag...Hydrothermal clay minerals that formed in the main metallogenic stage of the Changkeng disseminated-type gold deposit in central Guangdong were analyzed by the 40Ar/39Ar laser probe. The results give Ar-Ar isochron ages of 109.9 1.4 to 110.1 1.3 Ma, which are 30 to 50 Ma older than the age of silver ore bodies in the deposit. Both gold and silver mineralizations were not related to hidden granite batholith in the mining district, but probably related to evo-lution of sedimentary basins. This study shows that the 40Ar/39Ar laser probe is a sound dating tool applicable to sediment-hosted disseminated-type gold deposit.展开更多
文摘Sediment-hosted gold deposits are the major type of gold resources in China. Concentrated mostly in the two "Triangle Regons", they are generally hosted in fine-clastic turbidite,hydrothermal chert and marl ranging from Cambrian to Triassic in age, structurally controledby domes, anticlines and second-ordered faults. They are similar to the Carlin-type gold deposits in mineral assemblage and geochemical marks, with an element association closely comparable to those of modern springs and submarine hydrothermal sediments. Organic matter mayhave played an important role in mineralization. The ore solution may be hydrothermally altered meteoric water developed in areas of local geothermal anomaly.
基金supported by the National Natural Science Foundation of China(Grant Nos.49773195,49502029 and 49928201)the Key Scientific and Technology Project from the Land and Resources Ministry of China(Grant No.200206)+3 种基金Trans—century Training Programme Foundation for the Talents from the Ministry of Education of ChinaVisiting Scholar Foundation of the State Key Laboratory of Mineral Deposit Research in Naniing Universitythe Visiting Scholar Foundation of Labs in Universitiesalso by the Lingnan Foundation of USA.
文摘Hydrothermal clay minerals that formed in the main metallogenic stage of the Changkeng disseminated-type gold deposit in central Guangdong were analyzed by the 40Ar/39Ar laser probe. The results give Ar-Ar isochron ages of 109.9 1.4 to 110.1 1.3 Ma, which are 30 to 50 Ma older than the age of silver ore bodies in the deposit. Both gold and silver mineralizations were not related to hidden granite batholith in the mining district, but probably related to evo-lution of sedimentary basins. This study shows that the 40Ar/39Ar laser probe is a sound dating tool applicable to sediment-hosted disseminated-type gold deposit.
