formation age

The field profile observation, indoor geological profile analysis, seismic profile analysis and the fission-track dating were used to study the formation age of dustpan fault depression.

利用野外剖面观察、室内地质剖面分析、地震剖面分析以及裂变径迹年代学等方法对鲁西隆起和济阳坳陷箕状断陷的形成时代进行了探讨。

The upper intercept age is the age of relict zircon, while the lower intercept age represents the formation age of diorite-porphyrite.

上交点年龄为残余锆石年龄，下交点年龄大致代表了闪长玢岩的形成时代。

Detailed petrologic, geochemical and Sr-Nd-Hf-U-Pb isotopic researches indicate that the Wuping granitic complex consist mainly of biotite granite and garnet-bearing granite with different formation age and petrogenesis.

岩石学、元素地球化学和Sr-Nd-Hf-U-Pb同位素的综合研究显示，武平花岗质杂岩体是由形成时代和成因不同的黑云母花岗岩和含石榴子石花岗岩组成。

Layered gabbro ( layered cumulate gabbro) was derived from magma chamber under ridge, thus its formation age records the generation of oceanic crust.

层状辉长岩（或堆晶层状辉长岩）通常起源于洋脊下的岩浆房，因而它的形成年龄代表洋壳形成的时代。

Formation age and evolutional history of the Kirin meteorite

吉林陨石的形成时间与演化历史研究