Secondly, based on the microbeam analytical technique, on the one hand, through investigating the characteristic of major elements in the mantle minerals the author acquired the static information from mantle ; on the other hand, through multi - point analysis of a part of the minerals from mantle, the auther got dynamic information from mantle. finally, generalizating the fruits of this study and predecessors, the autor holds that the constituents of lithospheric mantle possibly includes spinel lherzolites, clinopyroxenites, websterite, dunite, harzburgites, garnet lherzite, phlogopite lherzite, eclogites, clinopyroxene megacrysts ; compared with east china and north china platform, the research field mantle shows the characteristics of higher degree of partial melting processes and more depleted mantle ; the. upper mantle beneath north hetian area is heterogeneous, with a tendency of deficit in a12o3 and lree from kaliyang in west hetian to the river basin of kalakshi river and yulongkashi river ; the subduction of the crust beneath north hetian has ever occurred in geological history and caused the mixing of mantle - crust ; the depth of the origination of basaltic magmas beneath north hetian exceeds 73km ; the thickness of the lithosphere beneath the research area amounts to 204. 9km ; the mantle beneath north hetian has geological condtions for forming diamond deposits
最後,綜合本區幔源礦物和地幔
巖石的特徵以及地球物理資料,得出如下結論:本區上地幔的物質組成有尖晶石二輝
橄欖
巖、二輝
巖、單斜輝石
巖、純
橄欖
巖、方輝
橄欖
巖、石榴石二輝
橄欖
巖、金雲母二輝
橄欖
巖、榴輝
巖;與中國東部以及華北地臺上地幔相比,研究區上地幔具有富集主元素中相容元素和虧損其中的不相容元素的特徵,局部熔融程度較高;上地幔存在橫向和縱向的不均一性,從西部的克里陽到喀拉喀什河和玉龍喀什河流域, al和lree富集程度呈下降趨勢,不同來源的相同礦物中主元素的含量差異較大;地質歷史時期這里可能發生過地殼俯沖並產生殼幔混合作用;玄武
巖漿的起源深度73km ;從幔源重砂礦物的溫壓估算結果,可以推斷出
巖石圈厚度可達204 . 9km ;綜合
巖石圈物質組成特徵、
巖石圈熱狀態、地幔溫壓狀態、氧逸度以及幔源
巖石和幔源礦物的化學成分,認為研究區具備了金剛石成礦地幔地質條件。
Electrical conductivities of quartz, olivine, dunite, iherzolite, pyroxenite, and megaaugite were measured by virtue of the new system ; whereas, the electrical conductivity of gabbro was measured by means of the old one. an interesting outgrowth of the present study is the measurement of the complex impedance of a series of quartz plates with different orientations
石英(人造水晶) 、
橄欖石、純
橄欖
巖、輝石
巖、二輝
橄欖
巖、巨晶輝石的電導率測量是在新的測量系統下獲得的,而輝長
巖的電導率測量是基於lcr儀為測量儀器的測試系統下獲得的。
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
內蒙古四子王旗地區地處華北板塊北緣,與西伯利亞板塊的接合部,其早白堊世
橄欖玄武
巖中發現大量下地殼麻粒
巖捕虜體,並可見輝石長石捕虜晶。
The determinative characteristics of common rock forming minerals containing quartz group, feldspar group, mica group, hornblende group, pyroxene group, olivine group and carbonatite minerals will be discussed in greater detail
對常見造
巖礦物,如石英類、長石類、雲母類、角閃石類、輝石類、
橄欖石類、碳酸鹽類礦物的鑒定特徵將予以詳細的說明。
Below the lithosphere is the rheosphere comprising partly fused peridotite.
巖石圈之下是由部分熔融的
橄欖
巖所組成的軟流圈。
The magnesite originated from the peridotite by weathering.
菱鎂礦是由
橄欖
巖風化形成的。
High - mg volcanic rocks approach the primitive mantle compositions, and their magmatic source is close to the composition of bse, derives from the lower mantle and formed by this type - mantle rocks " fractional melting highly ( > 25 % ). high - mg volcanic magma, formed in the axis of the emei mantle plume, underwent the crystallization differentiation of olivines and some pyroxenes ; some olivines reflect fair cumulus crystallization
高鎂火山
巖接近於原始
巖漿的組成,
巖漿源區與地球平均成分bse的成分特徵相近,起源深度為下地幔,為該地幔
巖較高程度的部分熔融( 25 )而形成的。高鎂火山
巖處于地幔柱的軸部,經歷了
橄欖石及一定程度的輝石分異結晶,並且
橄欖石顯示出一定的堆晶作用。
Monticellite nepheline basalt
鈣鎂
橄霞玄武
巖
Near the border zone an important string of nickeliferous peridotites is emplaced.
在靠近交界上有重要的一連串的含鎳
橄攬
巖體的侵入。
The olivine grains in the troctolite of the upper zone are rather short and thick.
上
巖帶
橄長
巖中的
橄欖石顆粒相當短粗。
Ultramafic rock fragments, which almost is altered to ophite, distributed in structural zone and displayed structural lens. so far, 9 fragments were discovered and mapped in nujinshan and bujing area ultramafic rock can be divided two kinds according to it ' s geochemical characteristics. one can be correlated with metaperidotite, which represented residual part that primary pyrolite underwent moderate partial melting, from some representative ophiolite melange in the world
按超鎂鐵
巖類的地球化學特徵可將其劃分為兩類:一類具有較高而穩定的mgo 、較低的al _ 2o _ 3 、極低的cao , m f值為8 . 0 ? 8 . 4 ,按標準礦物組合進行分類可定為方輝
橄欖
巖,且均為fa _ ( 100 ) 、 en _ ( 100 )的鎂質端元組分;可與世界上一些典型的蛇綠
巖套中變質
橄欖
巖進行對比,代表了原始地幔中等部分熔融作用后殘余物。
A recent discovery of peridot in the cashmere region of pakistan has renewed its popularity
變質的含鐵沉積物和白雲石灰
巖中,完全由
橄欖石構成。
This new source of peridot displays a beauty of color and transparency not found in the earlier sources
橄欖石也是構成石隕石的主要礦物之一。
橄欖石不含石英,因此不能生於花崗
巖中。
Qimanyuter ophiolite melange crops out 1 - 3 km in width and extends ew - nee about 50 km, parallels to the kunlun mountains. qimanyuter ophiolite melange is composed mainly of serpentinite ( metapyrolite ), peridotite, bedded gabbro, grbbro, diabase sheet and pillow - like and massif basalt as well. associated sedimentary rocks with this ophiolite melange include silicalite, dark gray silicalite and thin - bedded limestone
該混雜巖帶所包含的主要巖性單位包括:蛇紋巖(變輝橄巖) 、橄欖輝石巖、層狀輝長巖、輝長巖、輝綠巖席、枕狀、塊狀、杏仁狀玄武巖,與之共生的沉積巖為紫紅色硅質巖、深灰色硅質巖、薄層灰巖等。