Timing And Evolution Of Granitoids Magmatisms In The Wulandele Molybdenum-Copper Polymetallic Deposit Of Inner Mongolia

Granitoids petrofabric reflects the cooling history of parental magma in the Awulale molybdenum-copper polymetallic deposits of inner mongolia. Combined with petrography, rock chronology and chemical data, can provide physical and chemical information about the evolution of a magama body. The rocks classified four categories, namely, biotite monzonitic granite, fine-grained granite, granodiorite and granite porphyry. Based on rock fabric and chemical analysis in the study area, and integration zk903 drilling space order, the biotite monzonitic granite and diorite are an early intrusion, fine-grained granite mostly intruded into the old rock, are later intrusions, this process formed highly fractionated type of rock, such as granite porphyry and granodiorite etc.According to 127 published zircon ages, these granitoids were mainly emplaced during the intervals 135-145 Ma, 160-165Ma(Early Yanshanian period), 290-320 Ma and 345-360Ma(Indosinian hercynian). With the early Yanshanian period granitoids in zircon form a single whole, the ages relatively concentrated, moreover Indosinian-hercynian period granitoids in the zircon is mostly of old, side new inherited zircon, the age is big difference. The granitoids have Si O2 of 59%-79% with high K2O+Na2O(3%-9%) and(9%-17%)Al2O3 contents. P2O5,K2 O,Al2O3,Ti O2,Ca O,Mn O,Na2 O and Mg O also show linear correlations with Si O2, they stand for the typical evolution of crystallization differentiation of the trend. Rocks show the characteristics of high calcium aluminum, that belong to A type in I. Rare earth element distribution of the graph is the right type, show europium(Eu) negative anomaly. Granite porphyry and granodiorite are less than biotite monzonitic granite and fine-grained granite in the rare earth contents, that illustrate the light colors mineral such as feldspar and quartz have been separation-recrystallization.Paleozoic granite hinterland is affected by the regional strike-slip stress, by pulling tension for a long time, formed the structure of the block style, It’s this structure to control the way of Yanshan period rock intrusion, caused the granitic magma to full hybrid old rock and hydrothermal full extraction of ore-forming elements. Molybdenite mineralization age and Re contents to determine the material supply relate to Yanshanian magmatic hybrid closely and hydrothermal process. Rock space time and evolution relationship and geochemical data comprehensive analysis can contribute to our understanding of the relationships between physical and chemical processes in a magma system, and provide relatively comprehensive insights into the petrogenesis.