Studies On Metallogenic Model And Metallogenic Prediction Of The Jianfengpo Tin Deposit In Pengshan Ore Field, Jiangxi, China

Jianfengpo tin deposit is a large tin deposit in Pengshan tin-polymetallic ore field, De’an county, Jiangxi. The geological exploration and scientific research work in this area has been carried out in the past 50 years, and a number of important results have been achieved. For example, it was basically found out that the ore-forming materials mainly come from the tin-bearing granitic magma, formed by partial melting of tin-bearing sialic rock, and its ore-bearing fluid; The metallogenic model is initially established, which is the horizontal migration of ore bearing hydrothermal fluid along the interlayer slide fault, and ore bodies are halo-distribution. However, it is not clear which kind of granite including biotite granite and two-mica granite is more closely related to mineralization. In addition, the mechanism of tin and other minerals provided by the granite is also unclear. Furthermore, the existence of the vertical migration of ore bearing hydrothermal fluid in Jianfengpo tin deposit is worth further study. Regarding the problems above, this paper mainly focuses on the metallogenic material source and ore-controlling structure factors of Jianfongpo tin deposit, aiming to establish a new metallogenic model, and evaluate and predict the resource potential. Based on the consolidation and analysis of previous data, we conducted diverse study on the deposit, which include petrology and chemical mineralogy of different types granite, comparison of alternation and mineralization features and work of controlled source audio-frequency magnetotellurics (CSAMT). The main results obtained are as follows.l.Deep in the Jianfengpo deposit, there are homologous composite body with Pengshan concealed rock body, which including biotite adamellite and two-mica alkali feldspar granite and the latter has more closely relationship with metallogenic, for the release of metallogenic material in the process of Biotite alteration.2.The bottom-up vertical migration of ore-bearing fluid is an important metallogenic ore migration pattern in Jianfengpo tin deposit. The deep fault F9 together with its secondary fault F10 form the vertical migration channel, which is an important ore-conducting and ore-controlling structure.3.this sduty establishes new metallogenic model, which reveal that except for the presence of ore-bearing hydrothermal horizontal migration, there are vertical migration metallogenic characteristics in Pengshan ore field. This model supplement and perfect the comprehensive metallogenic model of this ore field.4.According to the new metallogenic model, we carried out metallogenic potential analysis of deep and peripherals parts of the ore field, determined prospecting direction and ore-hosting horizon, proposed three peripheral prospecting targets and resource integration recommendations and provided succeed mineral resources that can Sustaina mining life for Jianfengpo tin deposit.