关键词: 火山岩, 次火山-浅成相, 闪长质岩体, 成矿规律

Abstract:

According to diagenetic epoch, composition, associated deposit types and metallogenic ages, the Mesozoic volcanic rocks in Northeast China can be divided into three volcanic belts. The diagenetic epoch of the western and southern volcanic belts change from 150 to 120 Ma and from 205 to 112 Ma, respectively. Volcanic rocks in both belt are potassium-rich alkaline-subalkaline trachybasalt-trachyandesite-trachyet, metallogenic epoch of the western belt change from 140 to 130 Ma (froming the southern section of the metallogentic epoch is too large). Metallogenic epoch of the southern concentrates in 200 to 108 Ma. There is a close relationship between mineralization and subvolcanic-hypabyssal granitic rocks. Mineral resources mainly contain silver, lead, zinc, copper, molybdenum and other polymetallic series. The diagenetic epoch of the eastern volcanic belts varies from 140 to 110 Ma, and the vocanic rocks mainly include potassium alkaline-subalkaline trachyandesite, trachyet, andesite, dacite, rhyolite. The metallogenic epoch changes from 130 to 110 Ma. Gold and polymetallic mineralization have genetic relationship with subvolcanic and hypabyssal dioritic rocks. Based on the comparison of typical gold deposits in NE China, the prospecting direction of gold is also discussed.

Key words: volcanic rocks, subvolcanic-shallow phase, dioritic , rock, metallogenic regularity