火成巖塊體 的英文怎麼說
中文拼音 [huǒchéngyánkuāitǐ]
火成巖塊體
英文
volcanic block-
And apatite. by these analyses and comparison with general granite both in china and the world and with the granite in other au or cu belt in china, the characteristics of the granite in this area are concluded as follows. it belongs to magnetite - i or syntectic granite and has crust - mantle mixed characteristics ; it was formed mainly by crystallization differentiation of melting magma and multiphase varied intrusion ; the degree of differentiation evolvement is not high ; the granite and its enclaves p. re congenetic ; the range of temperature is about 500 - 700, the range of pressure is about 2. 50 gpa - 4. 35 gpa, and the range of oxygen fugacity ( lg fo2 ) is - 15. 53 - - 14. 00 ; most granite bodies formed before the collision of plates, and few formed after the collision of plates
通過對測試數據的分析與綜合研究，並同中國和世界一般花崗巖類以及中國主要金、銅成礦巖體的花崗巖類進行對比，得出本區花崗巖類巖石具有以下特徵：屬磁鐵礦-型或同熔型花崗巖，其巖漿物質具殼幔混源特徵：主要由熔融態巖漿經結晶分異作用，通過多期變速上侵而形成；其分異演化程度較低；寄主巖基和包體具有同源性；巖石的形成溫度范圍約為500 - 700 ，壓力大約為2 . 50gpa - 4 . 35gpa ，氧逸度值1gfo _ 2為- 15 . 53 ? 14 . 00 ；該巖帶主要形成於板塊碰撞前消減的活動板塊邊緣期，為燕山至喜馬拉雅早期的大陸邊緣火山弧環境的產物。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後期蝕變作用，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。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同位素組成上，中基性火山巖為中等富集的sr和低的nd同位素比值；中酸性火山巖的sr同位素比值總體較中基性巖高且變化大，類似華北陸塊下地殼巖石的同位素組成特徵。
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