Luzong Basin, Lujiang Co., Hefei, Anhui, Chinai

Regional Level Types
Luzong Basin	Basin
Lujiang Co.	County
Hefei	Prefecture-level City
Anhui	Province
China	Country

There are more than 30 intrusive rock bodies distributed within the Luzong basin. The formation of these intrusions is closely related to regional volcanic activity. Based on their lithology, the intrusion can be primarily classified into three types: monzonite, syenite, and A-type granite. Monzonites have a larger outcrop area and were formed during the period of 134–130 Ma. They are mainly distributed in the northern part of the basin and are closely related to the magmatic activity of the Longmenyuan and Zhuanqiao cycles of volcanic rocks, representing different forms of the same magmatic activity. Examples of monzonite bodies include Bajiatan, Longqiao, and Luoling bodies. Syenites, with a larger outcrop area, were formed during 129–123 Ma and are distributed in the southern part of the basin. They are mainly controlled by volcanic structures and north–northeast trending faults within the basin, corresponding to the magmatic activity of the Shuangmiao and Fushan cycles of volcanic rocks. Examples of syenite bodies include Tudishan and Fenghuangshan bodies. A-type granites are mainly distributed in the southern and southeastern parts of the basin and are primarily controlled by regional north–northeast trending major faults, independent of the basin’s volcanic structures. Examples of A-type granite bodies include Chengshan, Huashan, and Huangmeijian bodies.
The Luzong basin is a mineral cluster consisting of various deposits such as iron, sulfur, copper, lead–zinc, alunite, gold, and uranium. On the western side of the basin, there is Shaxi porphyry Cu (Au) deposit. The main types of deposits within the basin include an Au-Cu deposit-bearing tourmaline breccia pipe (Huangtun deposit), which is not found in causative intrusions; skarn Fe deposit (Longqiao deposit), iron oxide–apatite deposit (Nihe, Luohe, Dabaozhuang, Makou deposit); hydrothermal vein Cu deposit (Jingbian, Shimenan); the abovementioned kinds of deposits are related to the Zhuanqiao Formation; Pb-Zn (-Ag) deposits (Yueshan, Zhugang), which are spatially and temporally related to monzonite and diorite intrusions; U-Au deposits, which are in time and space related to syenite and A-type granite in the basin margin, respectively.
The iron ore reserves in the basin exceed 1.2 billion tons, with an average grade of 43.9%. The S-Fe reserves amount to 670 million tons, and the copper metal reserves are 16.61 million tons, including a resource estimate of 15.1147 million tons of gold–copper ore from the Huangtun copper–gold deposit. The reserves of alunite are 73.18 million tons.

Other Regions, Features and Areas containing this locality

References