Geochemical Characteristics and Paleoenvironment of Toutunhe Formation-Qingshuihe Formation in Qigu Fault-Fold Belt

doi:10.7657/XJPG20220508

Abstract

Abstract:

In order to determine the geochemical characteristics and paleoenvironment of the Toutunhe formation-Qingshuihe formation in the Qigu fault-fold belt of Junggar basin, the element analysis was carried out using the X-ray fluorescence spectrometer. Such elements as vanadium (V), chromium (Cr), nickel (Ni), cobalt (Co), strontium (Sr), zirconium (Zr) and gallium (Ga), which are sensitive to the depositional environment, were selected to systematically analyze the characteristics of paleo-oxidation-reduction conditions, paleosalinity, paleo-water depth, and paleoclimate in the study area. The results show that the Toutunhe formation-Qingshuihe formation in the study area was deposited in an oxidation environment, and occasionally in short-term weak oxidation-weak reduction environment. Sensitive elements (e.g. Ga and Sr) and Sr/Ba value indicate that the Toutunhe formation-Kalazha formation was dominantly deposited in a freshwater environment, and possibly a short-term brackish water environment locally, and the Qingshuihe formation exhibits relatively frequent paleosalinity fluctuation and was deposited in an alternating environment of saltwater and freshwater. According to the Co estimation, the water depth of the Toutunhe formation-Qingshuihe formation rangef from 2.05 to 74.20 m, and fluctuated greatly during the depositional period. The climate changed from warm and humid to arid and hot during the deposition of the Toutunhe formation-Kalazha formation, and shifted to warm and humid during the deposition of the Qingshuihe formation.

Key words: Junggar basin, Qigu fault-fold belt, Toutunhe formation, Qingshuihe formation, geochemical characteristic, depositional environment, paleosalinity, paleoclimate

CLC Number:

TE121.31

WANG Yaru, ZHANG Changmin, JI Dongsheng, ZHU Rui, FU Wenjun, WANG Zeyu, LIU Jiale. Geochemical Characteristics and Paleoenvironment of Toutunhe Formation-Qingshuihe Formation in Qigu Fault-Fold Belt[J]. Xinjiang Petroleum Geology, 2022, 43(5): 563-571.

Figures/Tables 6

Fig. 1.

Fig. 2.

Table 1.

Results of geochemical analysis of samples from Toutunhe formation-Qingshuihe formation in Qigu fault-fold zone, Junggar basin"

层位	样品	Mn含量/ （μg·g^-1）	P含量/ （μg·g^-1）	Sr含量/ （μg·g^-1）	Ga含量/ （μg·g^-1）	Ni含量/ （μg·g^-1）	Sr/Ba	Sr/Cu	Cu/Zn	V/Cr	Ni/Co	V/Sc	Zr/Al	Mg/Ca	C值	古水深/m
清水河组	A22	62.75	14.85	293.70	10.00	11.50	0.89	0.40	10.83	1.27	2.67	6.42	37.20	0.10	0.43	6.04
	A21	92.96	10.04	391.50	4.90	10.40	2.97	0.54	12.32	1.90	2.26	4.18	18.27	0.19	0.21	11.41
	A20	589.51	299.08	122.80	23.30	43.00	0.27	0.14	6.53	1.00	3.98	13.59	28.24	5.52	0.86	37.21
	H35	543.03	75.97	1 862.80	1.20	6.50	20.16	1.96	17.81	1.00	5.42	1.11	0	0.01	0.05	2.05
喀拉扎组	Q7	443.10	234.46	127.60	15.00	21.30	0.24	0.69	7.01	1.00	2.88	5.28	22.32	0.45	0.93	14.17
	Q6	534.51	278.56	138.80	19.90	32.20	0.31	0.63	8.24	1.00	2.46	5.73	26.67	1.16	0.57	38.42
	Q5	794.79	267.21	182.90	18.80	29.80	0.49	0.29	6.13	1.00	2.64	6.94	24.74	0.38	0.76	39.59
齐古组	Q4	642.96	246.25	267.40	20.40	25.30	0.69	0.43	6.09	1.00	2.30	4.72	27.32	1.45	0.67	32.76
	Q3	720.42	243.63	634.50	17.90	21.50	1.53	0.61	8.85	1.00	2.34	5.46	28.67	1.30	0.38	21.89
	Q2	317.14	268.08	315.10	19.10	19.20	0.70	0.95	5.06	1.00	2.74	4.87	24.12	0.99	0.90	9.35
	Q1	53.45	14.41	110.00	14.00	16.10	0.29	0.08	11.37	2.15	2.18	5.63	24.36	0.05	0.39	16.71
头屯河组	A13	99.15	21.83	175.20	15.20	26.70	0.59	0.44	4.69	1.22	2.38	4.20	26.77	0.10	0.81	29.29
	A12	184.37	21.83	205.40	10.80	19.40	0.97	0.78	4.37	1.47	1.76	3.11	23.28	0.12	0.72	27.22
	A11	101.48	20.08	181.20	17.30	33.50	0.61	0.58	3.27	1.38	2.13	5.00	22.88	0.13	1.05	71.33
	A10	65.07	29.25	268.40	22.20	33.80	0.54	0.28	6.77	1.52	2.10	8.51	33.09	0.10	0.67	64.71
	A8	1 062.82	56.32	200.30	10.50	21.00	0.15	0.28	8.52	1.88	1.43	8.91	27.02	0.09	1.68	41.62
	A7	679.37	58.51	193.20	18.30	30.80	0.51	0.40	6.07	1.39	2.83	6.33	27.22	0.07	0.82	37.75
	A6	66.62	34.93	197.90	25.80	39.00	0.44	0.25	5.56	1.51	2.29	6.10	30.23	0.09	0.76	65.42
	A5	27.11	10.92	140.30	21.80	23.50	0.34	0.20	7.12	1.57	2.08	8.09	28.21	0.06	0.77	32.35
	A4	72.82	20.96	201.60	22.70	34.00	0.46	0.46	3.13	1.62	1.91	7.52	24.98	0.08	1.16	74.20
	A3	48.80	34.06	204.80	21.60	30.10	0.47	0.25	6.49	1.57	2.28	7.60	28.54	0.10	0.69	48.61
	A2	33.31	30.13	237.30	16.00	25.70	0.48	0.42	6.40	1.87	1.99	8.47	21.13	0.08	0.87	48.80
	A1	51.90	35.80	250.20	15.90	26.10	0.52	0.43	6.52	1.87	1.63	6.58	22.27	0.09	0.84	70.80

Table 1.

Table 2.

Fig. 3.

Fig. 4.

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