秦岭洛阳—伊川—十堰—秭归地学断面大陆岩石圈的岩石学模型

根据该地学断面Ｖｐ结构模型，造山带中基性火成岩、金伯利岩和花岗岩中的深源包体资料，以及火成岩和变质岩，特别是超高压变质岩和超基性岩的分布和组成所揭示的壳幔深部组成的信息，结合与相对应的岩石实验Ｖｐ数据的对比，建立了秦岭洛阳－伊川－十堰－秭归地学断面及邻区的岩石圈组成的岩石学模型。这一岩石学模型表明，华北与扬子克拉通，南北秦岭造山带与其克拉通的过渡带岩石圈的岩石学模型各不相同。华北克拉通下地壳是以麻粒岩相中酸性片麻岩和紫苏花岗岩为主，同时含有基性麻粒岩，而扬子克拉通的下地壳是以角闪岩相－麻粒岩相酸性片麻岩和ＴＴＧ为主体，广泛存在基性火成岩层。南北秦岭造山带的中下地壳各自继承了扬子和华北克拉通的中下地壳的特点，但已被强烈改造；南北秦岭造山带上地幔组成差异性较大，北秦岭上地幔上部以榴辉岩及榴闪岩为主，而南秦岭以蛇纹石化橄榄岩为主体，各单元１００ｋｍ以下的地幔都是一样的，都是石榴石二辉橄榄岩组成。因此，秦岭造山带是一个具有近３０亿年历史的由不同大陆块体拼合组成的，不具简单的岩石圈分层结构样式。

The Petrology Model of the Geoscience Transection,for the Continental Lithosphere Beneath Luoyang-Yichuan-Shiyan-Zigui,Qinling,China

In accorolance with p--wave (Vp) model of this cross section and deep--seated source xenoliths data of the basic igneous rocks and kimberlites or granite intrusion on orogenic belts, and in view of that follows: information of crust and mantle deep constiture and evolution from igneous and metamorphic rocks, specially high and ultra-high pressure metamorphic rocks and ultra--basic rocks, and as correlation with experimetal geophysical data of above--mentioned rocks. Besed on the study of above, it is possible to establish the lithosphere petrology model of this cross section.This model of petrology was suggested that the North China craton, the Yangtze craton, the Northern Qinling and the Southern Qinling Orogenic belts and intermediate zone of orogenic belts model of petrology make a great difference. The Northern China craton deep crust is mainly compossed of granulite factes intermediate--acidity gneiss and charnokites with minor basic granulite. Yangtze craton deep crust is mainly compossed of the hornblende--granulite facies acidity gneiss and TTG suites with a large quantity metamorphic basic igneous bedrock. Medium--deep crust on the Northern and Southern Qinling orogenic belts each and every to inherited Northern China craton and Yangtze craton medium--deep crusts characters, it's stongly to be rebuilded at Same time. The upper mantle on the Northern and Southern Qinling orogenic belts are great dlifferent from each other. The Northern Qinling Upper mantle is mainly compossed of eclogiees and horrblende-eclogites, The Southern Qinling is mainly compossed of serpentinized peridotites. All above--mentioned tectonic units deep 100~120km. There is Garnet lherzolite blow the mantle. To sum up, Qinling orogenic belts is that a bulk verious petrological tectonic Unit to make a whole. This bulk is recorded about 30 hundred my Earth evolition history, not a simple model of bed-sphere structure.