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The material for formation of the granitoids isderived from mixing sources of crust and mantle, with decreasing in crust-derived componentsfrom early to late.5. The tectonic setting for formation of the Mesozoic granitoids in the region isdefined as a post-collisional setting. The occurrence of a small part of rocks with characteristics ofcollisional or anorogenic granitoids provides evidence for the continuous process oftransformation of tectonic regime from collisional through post-collisional to anorogenic.6. Themultiple cycles of mantle-derived magma underplating caused by the multiple stages oflithospheric thinning in the Mesozoic result in the partial melting of middle to lower crust orcrust-mantle syntexis to form magmas. The crystallization of these magmas emplacing afterfractionation is responsible for the formation of the Mesozoic granitoids in this region.
形成花岗岩类的成岩物质来自壳幔混源。5、河南省西部地区中生代花岗岩类成岩构造环境为碰撞后环境,部分岩石具有碰撞期或非造山期花岗岩的某些特征,表明碰撞后阶段既是碰撞造山过程的延续,又是向非造山环境的构造转换时期,因而其岩浆活动在一定程度上仍然继承了碰撞前消减时期和碰撞时期已经活化的岩浆源区性质。6、研究表明,区内中生代多阶段的岩石圈减薄作用引发多旋回的幔源岩浆底侵以及中下地壳的部分熔融或壳幔同熔,由此形成的岩浆经分异演化后侵位可以形成区内的中生代花岗岩类。
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Study on the petrochmical,trace element chemical,REE geochemical and Pb isotopic geochemical characteristics of the Tongshan intrusive indicates that the quartz diorite,granodiorite and adamellite are products of three stages of the same periodfrom only one magmatic source.
通过岩石化学、微量元素地球化学、稀土元素地球化学、铅同位素地球化学特征研究表明,铜山石英闪长岩、花岗闪长岩、二长花岗岩是同一岩浆源同一时期三个侵入阶段的产物,铜山岩体幔壳同熔型的复式岩体,属太平洋钙碱性岩石系列。
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syntectic magma:同熔岩浆
同区沉积 isotopical deposit | 同熔岩浆 syntectic magma | 同熔作用 syntexis