陜西省柞水—山陽礦集區(qū)冷水溝銅鉬礦床地質(zhì)特征及找礦預(yù)測
[Abstract]:The intermediate acid small rock masses of Yanshanian are widely exposed in the Zhashui-Shanyang ore concentration area, and the porphyry skarn type Cu-Mo mineralization is generally developed around these intermediate acid small rock bodies, such as the Cu-Mo deposit in Zhigou, the Cu deposit in Xiaohekou and the Cu-Mo ore in Lengshuigou. In recent years, the research on geological and mineral resources in this ore concentration area is mainly focused on stratigraphy, division of tectonic environment, geochemistry and isotopic characteristics of rock mass, age of formation, source of magma and so on, but the systematic study of typical deposits (points) is not enough. Through detailed field geological investigation, microscopic identification, rock geochemistry analysis, Nd-Sr isotopic test, fluid inclusion testing and so on, the geological and alteration characteristics are summarized. The diagenetic tectonic setting and petrogenesis of the Lianggou small porphyry are discussed, the prospecting model in this area and its surrounding is established, the prospecting prediction is carried out and the prospecting criteria are put forward. The main results obtained are as follows: the mineralization types of the Shuanggou Cu-Mo gold deposit can be divided into porphyry type, skarn type and structural alteration type. The porphyry copper-molybdenum deposits (Dongzigou and Kongqiya sections), skarn copper deposits (Shuanglongzhai and Yindongya sections) and structural altered rock type gold and silver deposits (Nangou and Xujiawan sections) are formed from the Lengguogou porphyry to the periphery. The integrated porphyry ore-forming system .2 chilled gully porphyry is rich in silicon, Kalium-rich, quasi-aluminous, belongs to I or I A type transition type high potassium calcium alkali-potassium metaphysical series, with the characteristics of crust and mantle mixing, which is similar to typical ore-forming porphyry. The alteration of the rock mass and surrounding rock is stronger and has better spatial zonation, but the symmetry is not obvious. The outward alteration types of the porphyry are potash, sericite, skarn and hornstone. According to the mineral encapsulation relationship and the intercalation characteristics of veins in the Lianggou Cu-Mo deposit, the metallogenic period is divided into four stages: magnetite stage, early hydrothermal stage, middle hydrothermal stage and late hydrothermal stage. The ore inclusions of porphyry type and skarn type in this area are mainly gas-liquid two-phase inclusions, the inclusions containing NaCl crystals are occasionally found, and the ore-forming fluids belong to medium temperature and medium salinity, and the ore inclusions are mainly formed in the early and middle hydrothermal stage of the ore inclusions, and the ore inclusions of skarn type and skarn type in this area are mainly gas-liquid two-phase inclusions. Fluid boiling occurs during mineralization. The composition of hydrogen and oxygen isotopes indicates that the ore-forming fluids are mainly derived from magmatic hydrothermal fluids, with the participation of a small amount of atmospheric precipitation. The sulfur isotopic composition in pyrite shows that mantle sulfur is the main source of sulfur according to the petrogeochemical and Nd-Sr isotopic characteristics of the rock mass. It is concluded that the diagenetic and metallogenic tectonic setting is a local extensional environment in the early and middle Yanshanian intracontinental collision and compression setting. The porphyry body experienced partial melting, slight assimilation and differentiation during its formation, and its geochemical characteristics showed that the crust and mantle mixed source .5 was altered according to the ore characteristics. The ore-forming model of Lenggou copper-molybdenum deposit is established and the prospecting criteria are summarized. It is pointed out that attention should be paid to small porphyry bodies, fault intersections, strong alteration areas and Cu-Mo-Ag-Au-As element assemblage anomalies in the prospecting process. Based on the study of the Lianggou porphyry copper-molybdenum deposit and the geophysical and chemical remote data of the area and the region, the prospecting prediction is carried out. It is considered that the ore prospecting in this area should focus on the areas of Yindongya and Dongzigou where the combination of Cu-Mo anomaly and IP anomaly is better than that of Yindongya and Dongzigou where the range of Cu-Mo anomaly is large.
【學(xué)位授予單位】:長安大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:P618.41;P618.65
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