额尔古纳地区有色、贵金属成矿特征

额尔古纳地区是一个重要的有色、贵金属成矿省.区内金、银、铅、锌、铜等矿产具明显分带性，可划分为耳布尔、上护林及恩和3个成矿小区，分别以银铅锌、铜多金属、金为主.该区在J₃-K₁时期发生了强烈的构造-岩浆活动，这些矿产在成因上均与J₃-K₁时期酸性岩浆侵入作用密切相关，成矿热液主要来源于岩浆热液.矿体主要受次级张性裂隙控制，以NW向为主.成矿时代主要为J₃-K₁.

METALLOGENIC CHARACTERISTICS OF NONFERROUS AND NOBLE METALS IN ERGUN REGION

Ergun region is located in the northeast of Inner Mongolia autonomous regions This area and Chaobasan region in Mongolia and Chita region in Russia make up of an important province of nonferrous and noble metal resources Four faults of NE NNE striking—Deerbugan, Jierbugan, Hawuer and Ergun River—control the distribution of the nonferrous and noble metal resources Hawuer and Jierbugan faults divide Ergun region into three mineralizing areas—Enhe, Shanghulin and Erbuer areas Enhe area is an upwelling area,where Hercynian granites occupy dominantly,followed by pre Mesozoic formation Gold is the main mineralization in the area Erbuer area is a secondary down warping area near Hailaer basin Late Jurassic early Cretaceous volcanic rocks are domonent,and late Jurassic granites come second Ag Pb Zn mineralization is dominant in the area Shanghulin area is an intermediate area between Enhe and Erbuer areas Among the outcropping rocks,there are Hercynian granites,as well as late Jurassic granites and late Jurassic early Cretaceous volcanic rocks Cu polymetallic mineralization is main in the area After studying on Xiaoyinuogaigou and Xiajibaogou gold deposits,Deerbuer and Erdaohezhi Pb Zn Ag deposits in Ergun region,our results are as follows: 1 During J 3 K 1 there were a violent tectonic and magmatic movement in Ergun region Broadly distributed intermediate basic volcanic rocks of Tamulangou formation and acid intermediate volcanic rocks of Shangkuli formation had formed,as well as many acid intrusive bodies(including subvolcanic rocks) The origin of mineral resources in this region is closely related to this acid magmatic intrusion,for example,granite porphyry of Xiaoyinuogaigou and monzonite of Xiajibaogou gold deposits,quartz porphyry of Deerbuer and Erdaohezhi Pb Zn Ag deposits and Kaminusike Cu polymetallic ore spot 2 The orebodies are controlled by tensional fractures,mainly NW striking,for example,Xiajibaogou gold deposit,Deerbuer and Erdaohezhi Pb Zn Ag deposits,secondly S N striking,for example,Xiaoyinuogaigou gold deposit and Kaminusike Cu polymetallic ore spot Host structure are consisted of the tensional fractures and contact place between acid intrusive bodies and wall rocks 3 In Ergun region δ 34 S range from -5 2‰ to +5 5‰,mainly from +2 5‰ to +5 5‰.Sulphur mainly originate from abyssal Mesozoic magma The ore forming solution mainly originate from magmatic hydrothermal solution 4 The primary metallogenic epoch is J 3 K 1