内蒙古地区出露地壳元素丰度估算

doi:10.11720/wtyht.2020.1084

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Abstract

We figured out the estimated values of 12 major elements and 40 minor elementsof the exposed crust of Inner Mongolia with 392 samples which are collected from five seismic sections of Inner Mongolia. And the weighted values are obtained by the thickness of different rocks in every stratigraphy and the areas of stratigraphies and magmatic bodies in the geology map. The estimated values are proved reasonable by surface heat flow value, average seismic wave velocity and elements ratio.Comparing the major element estimated values with ones given by other researchers, the average composition of Inner Mongolia is similar to others’, which are also granodioritic, except that the Ca and Mg abundances are a little low. Researching on the estimated values of minor element, rare earth element and some element ratio, we found that there is intense crust differentiation in thenorth margin of North China Plate, and intense accretion inXingmeng Orogenic Belt.

Key words： Inner Mongolia exposedcrust elements’ abundance tectonic unit

Received: 17 February 2019 Published: 24 June 2020

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	Yue-Yue MENG
	Yue-Long CHEN

Cite this article:

Yue-Yue MENG,Yue-Long CHEN. Estimating the elements’ abundance of the exposed crust of Inner Mongolia[J]. Geophysical and Geochemical Exploration, 2020, 44(3): 470-479.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1084 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I3/470

Tectonic unit division and sampling location in the study area

The estimated elemental abundance values of the exposed crust of Inner Mongolia (including carbonate rocks)

The estimated elemental abundance values of the exposed crust of Inner Mongolia (without carbonate rocks)

Elements’ abundance of the exposed crust of Inner Mongolia, compared with other researchers’ results

Element radios, compared with other researchers’ results

TAS diagram(base map according to reference[27])
△—Inner Mongolia axis;□—Xingmeng orogenic belt;○—Inner Mongolia
1—olivine-gabbro;2—gabbro;2a—alkaline gabbro;3—gabbro-diorite;4—diorite;5—granodiorite;6—granite;7—quartz monzonite;8—syenite;9—monzonite;10—monzodiorite;11—monzogabbro;12—foid-gabbro;13—feldspatite;14—foid-monzodiorite;15—foid-monzosyenite;16—foid-syenite

Minor elements’ abundance of the exposed crust of Inner Mongolia, compared with other researchers’ results

Normalized mantle spider graph of minor elements,compared with other researchers’ results

REE pattern normalized to the chondrite,compared with other researchers’ results

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