In the light of analysis of the internal relations among the source strata for magmatism, thegranitic magmas and the endogenic metallizations, the basic regularity of petrogenesis and metallo-genesis of Nanling crust-...In the light of analysis of the internal relations among the source strata for magmatism, thegranitic magmas and the endogenic metallizations, the basic regularity of petrogenesis and metallo-genesis of Nanling crust-derived type granitoids can be generalized as follows: (1) Two suites ofsource strata for Magmatism-the Pre-Sinian and the Lower Sinianl here the unity of the old foldbasement, the source strata for magmatism and the source strata for metallization are particularlyhighlighted. (2) Multi-stage melting of source strata for magmatism resulting in the formation ofmajor ore-related granites of three different stages (the Late Jinningean stage, the Late Caledonianstage, and the Late Indosinian-Late Yanshanian stage) under the control of tw0 tectonic units(geosyncline and diwa). (3) Three endogenic meta1logenic epoches accompanying the three stagesof ore-related granitic magmatism. (4) One major metallogenic epoch characterized by concentrat-ed commercial metallizations in large scale related to the Yanshanian crust-derived type granites.Tectonically,this major metallogenic epoch is exactly consistent with the stage of violent diwa ac-tivity. This is by no means fortuitous, but is the unavoidable result of the development and evolu-tion of the objective geologic history.展开更多
文摘In the light of analysis of the internal relations among the source strata for magmatism, thegranitic magmas and the endogenic metallizations, the basic regularity of petrogenesis and metallo-genesis of Nanling crust-derived type granitoids can be generalized as follows: (1) Two suites ofsource strata for Magmatism-the Pre-Sinian and the Lower Sinianl here the unity of the old foldbasement, the source strata for magmatism and the source strata for metallization are particularlyhighlighted. (2) Multi-stage melting of source strata for magmatism resulting in the formation ofmajor ore-related granites of three different stages (the Late Jinningean stage, the Late Caledonianstage, and the Late Indosinian-Late Yanshanian stage) under the control of tw0 tectonic units(geosyncline and diwa). (3) Three endogenic meta1logenic epoches accompanying the three stagesof ore-related granitic magmatism. (4) One major metallogenic epoch characterized by concentrat-ed commercial metallizations in large scale related to the Yanshanian crust-derived type granites.Tectonically,this major metallogenic epoch is exactly consistent with the stage of violent diwa ac-tivity. This is by no means fortuitous, but is the unavoidable result of the development and evolu-tion of the objective geologic history.
