isoma 中文意思是什麼
isoma
解釋
五十馬-
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。
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