Studies on the metamorphic history of the granulites on a very old platform provide us some important information of the properties , status and forming processes of the lower crust and forming mechanism of the early continent crust 古老地台麻粒岩的变质历史研究可以为我们深入了解下地壳性质，状态及形成过程，探讨早期大陆地壳的形成机制提供重要的信息。
Siziwangqi of inner mongolia is located on the north margin of north china craton , the junction of north china craton and siberia . granulite xenoliths are found there in cretaceous basalt . these xenoliths are mainly plagioclase - pyroxenite 内蒙古四子王旗地区地处华北板块北缘，与西伯利亚板块的接合部，其早白垩世橄榄玄武岩中发现大量下地壳麻粒岩捕虏体，并可见辉石长石捕虏晶。
Finally , some possible physical mechanisms , for example the coulomb stress - triggering mechanism , the dynamic stress - triggering mechanism and the lower crust and upper mantle flow deformation mechanism , which may generate these coseismic and post - seismic anomalies , are discussed 同时，还从库仑破裂应力触发、动态应力触发以及下地壳和上地幔流动变形机制等方面，对这些大震效应作了一些成因机理讨论。
It was also indicated by the studies on a large number of pb isotope that pb in ores of the deposit chiefly came from volcanic rocks in the strata and later intrusions with derivation of a little pb from the normal deposit stratum 大量pb同位素研究也表明，矿床的矿石铅源跨越了下地壳、地幔和造山带演化线，形成混合铅带，多集中于地幔和造山带演化线附近，暗示pb主要来自地层中的火山岩和后期的侵入岩，少量来自正常沉积地层。
All of the mafic samples have age - corrected moderate enriched sr and enriched nd isotopic ratios and the felsic rocks span larger range in the initial sr and nd isotopic ratios than mafic volcanics , similar to isotopic compositions of lower crust of north china block 在sr - nd同位素组成上，中基性火山岩为中等富集的sr和低的nd同位素比值；中酸性火山岩的sr同位素比值总体较中基性岩高且变化大，类似华北陆块下地壳岩石的同位素组成特征。
The control of the deep - seated structural - magmatic process over the metallogenic system around the middle - lower yangtze river reaches is shown as : ( 1 ) the mantle uplift belt is closely related to the general geological background of the metallogenic system ; ( 2 ) the primitive magma originated from different parts of the mantle uplift belt ( mantle ridge or mantle slope ) shows differences in style of formation and composition and results in different magmatic series and metallogenic subzones , respectively ; ( 3 ) the varying depths of structural - magmatic chambers may form a " three - layered structure " ( central type , network - like and ring - like ) and this is the primary factor that controls the different magmatic series and the concerned cluster of ore deposits ; ( 4 ) the alkaline basaltic magma derived from the mantle ridge forms high - potassium and calcium alkaline magma and shoshonitic magma due to its altering intensity of afc process with the lower crustal material , which has something to do with the copper - gold and iron - sulphur metallogenic subsystems , respectively 深部构造岩浆作用对长江中下游成矿带安徽沿江地区成矿系统的控制表现为： ( 1 )地幔隆起带与成矿系统的总体地质背景的演变密切相关； ( 2 )源于地幔隆起带不同部位(幔脊与幔坡)的原始岩浆，其生成方式和物质组成不尽相同，它们分别产生相应的不同岩浆岩系列和成矿亚带； ( 3 )不同深度的构造岩浆房组成中心式网格式环带式“三层结构” ，是控制区内不同岩浆岩系列及有关矿床集中分布的主要因素； ( 4 )源于地幔隆起带脊部的碱性玄武岩浆，由于与下地壳物质发生的afc作用强度不同，形成了高钾钙碱性岩浆和橄榄安粗岩浆，分别与铜、金成矿亚系统和铁、硫成矿亚系统有关。
Geologists and geophysicists have carried out substantial work on petrology , geochemistry , chronology and geophysics , et al . , which yields important reference material and constrains for explanations of questions , such as the delamination and exhumation mechanism for the lower crust , models of the rapid uplift of himalayan orogen and deep subduction of india - eurasia plate . while only a little has been done to study the eastern syntaxis at present 地质学家和地球物理学家已经对西构造结进行了大量的岩石学、地球化学、年代学和地球物理学等方面的研究，为解释下地壳的拆沉、折返机制，喜马拉雅造山带的快速隆升和印度-欧亚板块的大陆深俯冲模式等提供了重要的参考信息和约束条件。
During the yanshanian phrase , the area is in the condition of contractional background , with multi - staged tectonic reversion . 5 . through studying the origin of volcanic rocks and the characteristics of magma evolution , it concludes that there exist 3 originated areas of magma - from mantle , crust , and mantle - crust exchange . the basic magma of nandaling volcanic rocks of early jurassic is derived from upper mantle ; the magma of tiaojishan volcanic rocks of mid jurassic is formed in the contractional tectonic setting , and derived from the transition zone of crust and mantle interaction ; the acid magma of l 5 、通过岩石化学、微量元素、稀土元素的研究，探讨了不同级别节律的火山岩成因、岩浆演化等特征，认为本区燕山期火山岩有三个岩浆源区，即地幔源、地壳源和壳幔混源，早侏罗世的南大岭旋回的基性岩浆，起源于上地幔；中侏罗世髫髻山旋回火山岩是在相对挤压环境中，岩浆起源于壳幔过渡带；晚侏罗世无负eu异常的酸性岩浆来源于下地壳的古老结晶基底的局部熔融，有负eu异常的酸性岩浆来源于上地壳的局部熔融；早白垩世火山岩基性岩浆起源于上地幔，中性岩浆起源于下地壳底部的壳幔过渡带。
A ree partition simulation suggests that the tianzhushan intermediate rocks can be generated by partial melting , in coupling with fractional crystallization , of dioritic gneiss which is similar in chemical compositions to the mafic rocks in the lower crust in north dabie ; partial melting of intermediate grey gneiss which is similar in chemical compositions to the middle crust in north dabie can generate the tianzhushan felsic rocks Ree配分的定量模拟计算结果表明，与基性下地壳相似的北大别基性闪长质片麻岩部分熔融并经过结晶分异能够形成与天柱山中性岩类似的稀土元素组成，而与中性地壳相似的北大别中性灰色片麻岩部分熔融能够形成与天柱山花岗岩类似的稀土元素组成。
There are distributed a great number of cenozoic basalts and mantle derived xenoliths in north china and south china . for understanding the materials constitutes , evolution , mantle metasomatism , and inhomogeneity of the lower crust and upper mantle , there is a must of doing some research on these host basalts and the xenoliths 华北、华南地区发育大量新生代玄武岩及幔源包体，对其进行研究，有利于进一步深入了解下地壳和上地幔的物质组成、演化、地幔交代和不均一性以及地球物理反演结果的可靠性等。
