摘要
山东半岛于220-120Ma时出现过3次地壳熔融事件。断裂花岗质岩浆带中,有3个亚旋回的花岗质岩浆活动过,其中包含了5个独立的岩石系列。最初形成的岩系的母岩浆,起源于麻粒岩相的下地壳。随地热的增高,岩浆起源层向角闪岩质的中地壳转移。在底辟花岗质岩浆带,先是从上地壳花岗质层生成岩浆,之后由中地壳产生岩浆。各亚旋回是以较富镁铁的岩浆的产生为起始,以生成近底共熔的岩浆为终结,它们是在特定层位以分层熔融形式生成的。
Three melting events of the earth's crust occurred during the period of 220—120 Ma in the Shandong Peninsula. Three subcycles of granitoid magma including five rock series were generated in the faulted granitoid magma belt. The parent magma of several rock series formed earliest originated from the lower crust of granulite facies; following the increase of geotherm, the source magma would migrate into the middle crust of amphibolite facies. In the diapiric granitoid magma belt, the granitoid magma was formed first in the granitic layer of the upper crust, and then in the middle crust. In each subcycle the generation of magma started with the generation of the more mafic one and finished with the low eutectic one; they were formed in the form of layered melting in a particular portion of the crust.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1990年第4期309-321,共13页
Acta Geologica Sinica
基金
国家自然科学基金
