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gabbro n.【地質學;地理學】輝長巖。gabbroic adj.

gabby

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。

There are three genetic types of mineral deposits in the beiya ore district : cu - au polymetallic deposits related to alkaline porphyries , comprising porphyritic cu - au deposits and polymetallic skarn deposits related to quartz - albite porphyry and quartz - k - feldspar porphyry ; fe - au deposits related to gabbro or basalt magma , consisting of magmatic fe - au deposits and sedimentary polymetallic deposits formed in caves and lakes ; and palaeo - placers formed at the weathering surface , in lakes and in karsts 北衙金礦有3種成因不同的礦床:與堿性斑巖有關的銅金多金屬礦,包括與石英鈉長斑巖和石英正長斑巖有關的斑巖型銅金礦床和矽卡巖型多金屬礦床;與輝長玄武巖漿有關的鐵金礦床,包括熔漿型鐵金礦床和噴流沉積型多金屬礦床,后者又有洞穴和湖相沉積環境之分;及古砂礦,有古風化殼型砂礦、河湖相古砂礦和洞穴沉積古砂礦。

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于lcr儀為測量儀器的測試系統下獲得的。

The alkaline basalts in southern hunan are suggested to have formed by small degrees of decompression melting of the asthenosphere mantle during the initial extension . the transitional ( the chebu gabbro ) and tholeiitic basaltic magmas were generated by relatively larger degrees of partial melting of the mantle 在裂谷初期,軟流圈地幔的小比例部分熔融形成堿性玄武巖(湘南) ,在裂谷拉張作用比較強、地幔部分熔融比例比較大時形成贛南和湘南的過渡型(車步輝長巖)及拉斑質玄武巖。

We deduce that it is a relic old crust that was brought upwards during the formation of neo - tethyan ophiolite . the step heating 40ar - ' 9ar spectra show that during 100ma , luobusha ophiolite suffered intensely alternation , which affected distinctly the k - ar system ; during 771ma some basalt formed in the country rock of xiubugabu ophiolite ; during 55ma , the pillow basalt of rikangba ophiolite affected by a strong thermal event ; all the variety of ages illustrates possible impacts of the subduction - collision between india and eurasia . through dissecting mainly the gabbro of luobusa ophiolite and studying the 40ar / 39ar ~ ( 40 ) ar ~ ( 39 ) ar階段升溫年齡圖譜顯示, 100ma左右羅布莎巖體經歷了較強的后期蝕變作用,對其k ? ar體系造成明顯影響; 77 1ma休古嘎布巖體圍巖中形成玄武質火山集塊巖; 55ma日康巴巖體巖石枕狀玄武巖受到較強熱事件影響;這些~ ( 40 ) ar - ~ ( 39 ) ar年齡上的變化顯示了印度板塊與歐亞板塊俯沖?碰撞對該區的強烈影響。

Geochronological , geochemical and sr - nd isotopic data are reported for the alkaline igneous rocks ( syenites and zhaibei aluminous a - type granite ) and chebu gabbro in southern jiangxi province . shrimp zircon u - pb dating results indicate that the quannan syenite , zhaibei a - type granite and chebu gabbro formed during the early yanshanian period 對贛南燕山早期的富堿火成巖(正長巖和寨背鋁質a型花崗巖)和車步輝長巖進行了詳細的年代學、元素和sr - nd地球化學研究。

The results of combined internal mineral separates and whole - rock sm - nd isochron age for gabbro dikes from : luobusha , angren and xiubugabu in yarlung zangpo ophilite zone are 177ma , 166ma and 173ma respectively . the 4lar - 39ar step heating spectra of rikangba ophiolite suggest that its formation age is also isoma . it indicates that there was a stronger regionally inagmatism during middle - early jurassic , and the time of i75ma was the main period of the magmatic event of yarlung zangpo ophilite 對鄔郁盆地嘎扎村組火山巖剖面的年代學研究表明,該區后碰撞期火山巖的~ ( 40 ) ar - ~ ( 39 ) ar年齡為12 ? 14ma ,侵入其中的花崗巖脈的~ ( 40 ) ar - ~ ( 39 ) ar年齡為10 . 84ma ,與岡底斯西段前人研究資料對比,認為岡底斯帶后碰撞火山巖時代有自西向東逐漸年輕的趨勢。

The mafic dikes also formed by the partial melting of enriched mantle , include gabbro , diabase ( distributing mainly in luxi ) and lamprophyres ( camptovogesite , odinite and hornblende lamprophyres ) ( mainly in ludong ) . for all the rocks , crustal contamination was absent when magma emplaced . 2 基性脈巖主要包括輝長巖、輝綠巖(主要分布在魯西地區)和煌斑巖(以斜閃煌斑巖為主,同時含部分拉輝煌斑巖和角閃煌斑巖) (主要分布在魯東地區) ,都為富集巖石圈地幔部分熔融的產物。

Based on an analysis of geochemical characteristics of rocks and trace elements as well as rare earth elements , this paper holds that they are products of crystallization differentiation of the same magma , that the major ore resource of this area is copper , and that gabbro - diabase is the main ore - bearing horizon 通過對巖石化學特徵和微量元素、稀土元素地球化學特徵的剖析,表明其是同一巖漿結晶分異的產物,本區主要礦產應為銅,輝長輝綠巖是主要的含礦層位。

It agrees with the fact that the gabbro is intruded by late ordovician granitic pluton . the pre - sinian basement strata exposed in the north kunlun massif are later archean - neoproterozoic milan group , changcheng system kaqiang group , jixian system liushui formation and qingbaikou system sulu formation 被蛇綠巖所分隔的昆北地塊上出露的前震旦紀基底地層為:晚太古代-新元古代米蘭巖群,長城系卡羌巖群,薊縣系流水巖組和青白口系絲路巖組。

The lithologies of intrusive rocks were re - determined , for example , the rock previously named as diorite in southern area was renamed as gabbro , and the dike rock distributed along nnw as spessartite which was related to formation of the zhulazaga gold deposit to some extent 對礦區各類侵入巖重新厘定了它們的巖性特征,如礦區東南部原閃長巖重新確定為輝長巖,確定nnw向分布的脈巖為閃斜煌斑巖,且認為后者和朱拉扎嗄金礦的形成有一定的關系。

Guided by theory and method of unit - superunit mapping in the granite area , study the lithology , lithochemistry , trace elements , and rare earth elements , er . of the wuzengsu gabbro body , and subdivide the body into four units 摘要借鑒花崗巖區單元超單元填圖理論方法,通過對烏增蘇輝長巖體巖石學、巖石化學、微量元素、稀土元素等特征的研究,將巖體劃分為四個單元。

The internal mineral separates and whole - rock sm - nd isochron age for gabbro dikes from the dangqiong ophiolite is 373 ? 8ma , inferring a magmatic activity during late devonian , which end ( t ) = + 3 . 3 suggests that its tectonic setting was probably oceanic island 其nd ( t ) = + 3 . 3 ,認為其時形成環境為洋島,可能代表了新特提斯蛇綠巖形成時所攜帶的古老洋殼。

The geochemical characteristics of gabbros from the jinshajiang ophiolitic melange indicate that they were derived from a mantle source different from that of volcanic rocks , which may be a product in the ocean rift in the earlier stage 東竹林蛇綠混雜巖中輝長巖地球化學特征表明,它與火山巖不同源,可能是洋盆裂谷初期的產物。

All these ductile shear zones are characterized by northward thrusting . the u - pb dating on zircons from the bedded gabbro of the qimanyuter ophiolite melange gives an age of 526 ? 1 ma ( early cambrian ) 在其曼于特蛇綠巖的層狀細粒輝長巖中獲得了鋯石u - pb年齡值為526 1ma (早寒武世) ,它被晚奧陶世花崗巖侵入。

Geochemical features and its tectonic implication of the jinningian wangjiangshan gabbros in the north margin of yangtze block 揚子北緣晉寧期望江山基性巖體的地球化學特征及其構造背景

Petrological characteristics and tectonic implications of the tahe gabbro in the northern part of the great xing ' an range 大興安嶺北段塔河輝長巖的巖石學特征及其構造意義

Isotopic age of shijuli gabbro in north qilian mountain and its geological significance 北祁連山石居里輝長巖的同位素年齡及其地質意義

Calc - alkali gabbro 鈣堿輝長巖