Study Of Late Paleozoic Mineralizing Tectonic Systems In West Junggar Area

The organic combination of tectonic systems with mineralization systems brings on the building of mineralizing tectonic systems (MTSs), which will prove to be important for study of regional mineralization and ore-field structural geology. The Western Junggar domino-type tectonic system(WJTS) is composed of the NE-extending left-lateral strike-slip Darabut, Mayile, and Baerleike faults in Western Junggar metallogenic belt(WJMB). Besides, the subordinate NE-extending faults constitute ring-type, λ-type system and broom-type fracture, which controlled the distribution of elements in granitic mass, Cu, Au, Mo deposits in Late Paleozoic in WJMB. Miaoergou mass is the typical alkali-granitic mass with the character of high Si, low Al, high K, which is A-type granite in the post-colision environment. The sourse of granite is probably the product of partial melting of the depleted mantle in low crust. There are many types and phases of metal deposits in WJMB. The date of geochronology show the following magma-metallogenic series in Kounrad of the Balkhash metallogenic belt:diorite-porphyrites (-327.3Ma)â†'Early porphyry copper deposits (little less than327.3Ma)â†'Terminal porphyry copper deposits (～315.9Ma)â†'quartz-biotite-diorite (～308.7Ma)â†'Early quartz-vein greisen W-Mo deposits (298-295Ma)â†'Alkali-granitic (～293.6Ma)â†'Terminal quartz-vein greisen W-Mo deposits (～289.3Ma). The magma-metallogenic seriesin Baogutu:Early granodiorite-porphyry (～335Ma)â†'Terminal diorite porphyrite (325～305Ma)â†'Porphyry copper (Au and Mo) deposits (310Ma). All these show that the WJMB is the eastward extension of the Balkhash metallogenic belt. Based on the Western Junggar MTSs, which is composed of WJTS (including other subordinate fault tectonic systems) and Porphyry copper (Au and Mo) mineralization systems in Late Paleozoic, divide3advantaged metallogenic areas, including Be-Cu-Au-Cr area in Jiaman-Yangzhuang-Saleinuohai; Au-Cr-Cu-Ni-Fe area in Saertuohai-Hatu-Bieluagaxi;Cu-Au-Cr area in Bogutu; and delimit potential prospective areas of porphyry copper deposits, skarn deposits and quartz-vein greisen W-Mo deposits.