Construction and Test of Geochemical Genes: Case Studies in China

doi:10.19657/j.geoscience.1000-8527.2020.049

Abstract

Abstract:

Geochemical gene is a new technique presented recently. According to the construction steps of a geochemical gene, a new lithogene called LG01 was presented and the early presented lithogene was named as LG02. Meanwhile, two rare earth element (REE) geochemical genes were also presented labeled as REEG01 and REEG02. These geochemical genes were tested on four weathering profiles which are LY18D06 profile developed over the Lianyang granite intrusion located in Guangdong Province, TT profile formed on the Fogang granite intrusion also in Guangdong Province, HK06 profile formed on the Neogene basalt in Hainan Province, and ZKD2 profile developed over a granodiorite intrusion in Beijing, China. The results indicate that lithogenes and REE genes are stable or have subtle differences in the weathered products. Furthermore, LG01 gene is more stable than LG02 gene and REEG01 gene is more stable than REEG02 gene in these weathering profiles. The sample’s gene similarity relative to the acidic rock in China (a virtual sample with the elemental abundance of acidic rocks in China) is called acidic similarity. According to the acidic similarities of LG01 gene, samples can be classified into three groups as acidic-like composition, intermediate-like composition, and basic-like composition (or two groups as intermediate-acidic-like composition and intermediate-basic-like composition). The acidic similarity of LG01 gene can be used as a tool to recognize the provenance of soils or weathered products tested on samples from the four weathered profiles. Based on the regional geochemical survey database and the geochemical gene techniques, (forensic) geological samples may be traced or located.

Key words: geochemical gene, weathering profile, heredity and inheritance, compositional classification and provenance tracing, sample traceability

CLC Number:

P595
P632

GONG Qingjie, WU Xuan, YAN Taotao, LIU Ningqiang, LI Xiaolei, LI Ruikun, LIU Mengxiang. Construction and Test of Geochemical Genes: Case Studies in China[J]. Geoscience, 2020, 34(05): 865-882.

Figures/Tables 7

References 47

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元素序号	岩性地球化学基因				稀土元素地球化学基因
	LG01^①		LG02^②		REEG01^③		REEG02^④
	元素	参考值	元素	参考值	元素	参考值	元素	参考值
1	Zr	147.0	Al₂O₃	11115.19	Pr	7.1	La	30
2	Ti	4 016	SiO₂	65.9	Nd	26	Ce	64
3	Al₂O₃	14.8	P	580	Sm	4.5	Pr	7.1
4	TFe₂O₃	6.4	Ti	3 000	Gd	3.8	Nd	26
5	SiO₂	60	La	30	Tb	0.64	Sm	4.5
6	P	756	TFe₂O₃	5	Dy	3.5	Eu	0.88
7	Pb	19	Th	10.7	Ho	0.8	Gd	3.8
8	Mn	940	Zr	190	Er	2.3	Tb	0.64
9	Th	5.72	Nb	12	Tm	0.33	Dy	3.5
10	Nb	14.5	Y	22	Yb	2.2	Ho	0.8
11	U	1.2	U	2.8	Lu	0.32	Er	2.3
12							Tm	0.33
13							Yb	2.2
14							Lu	0.32

元素序号	岩性地球化学基因				稀土元素地球化学基因
	LG01^①		LG02^②		REEG01^③		REEG02^④
	元素	参考值	元素	参考值	元素	参考值	元素	参考值
1	Zr	147.0	Al₂O₃	11115.19	Pr	7.1	La	30
2	Ti	4 016	SiO₂	65.9	Nd	26	Ce	64
3	Al₂O₃	14.8	P	580	Sm	4.5	Pr	7.1
4	TFe₂O₃	6.4	Ti	3 000	Gd	3.8	Nd	26
5	SiO₂	60	La	30	Tb	0.64	Sm	4.5
6	P	756	TFe₂O₃	5	Dy	3.5	Eu	0.88
7	Pb	19	Th	10.7	Ho	0.8	Gd	3.8
8	Mn	940	Zr	190	Er	2.3	Tb	0.64
9	Th	5.72	Nb	12	Tm	0.33	Dy	3.5
10	Nb	14.5	Y	22	Yb	2.2	Ho	0.8
11	U	1.2	U	2.8	Lu	0.32	Er	2.3
12							Tm	0.33
13							Yb	2.2
14							Lu	0.32