Study on Structural Dolomitization:Taking the Yingshan Formation of the Penglaiba Section in Aksu Area as An Example

doi:10.19657/j.geoscience.1000-8527.2023.008

Abstract

Abstract:

Through systematic field survey, lithology descriptions, sample collection, thin-section observation and geochemical analysis of the Yingshan Formation in the Penglaiba section of Aksu area in Tarim Basin, the local small-scale genesis of dolomite in the Yingshan Formation is analyzed in detail.The results show that the Yingshan Formation in Penglaiba section can be divided into upper and lower segments, and the overall lithology is limestone.The lower section comprises sparry algal arenaceous limestone, which has clear sedimentary characteristics of high-energy granular beach facies. The upper section is globular micrite limestone, which is dominated by low-energy beach and intertidal marine sediments.The profile is cut by several faults, and dolomite is locally developed near the fault of the lower segment of Yingshan Formation, distributed in lenticular or semi-layered form.The degree of dolomitization decreases gradually along the layer and away from the fault.Geochemical analysis of the dolomite shows that the rock has low Fe and Mn contents, overlapping with the surrounding limestone, and there is no distinction on Na and K contents from the limestone, reflecting that the dolomitization fluid is of marine origin.The Sr content is obviously higher than that of the surrounding limestone, indicating that the mica alteration was not supergene related.The REE compositions are characterized by enrichment of LREEs and depletion of HREEs.Eu shows obviously negative anomaly, while Ce shows slight depletion, similar to modern seawater.Carbon-oxygen isotopes of the dolomite samples are lighter than those of the limestone, indicating the evaporite property of the fluid.Through comprehensive research, we considered that the local dolomitization around the fault in the Yingshan Formation (Penglaiba section) may have occurred in the shallow burial stage.The dolomitization fluid may have come from the evaporated brine of the Middle-Upper Cambrian strata connected by the fault, which is a kind of small structural dolomite different from typical tectonic hydrothermal dolomite.

Key words: dolomitization, Yingshan Formation, Penglaiba section, Tarim Basin

CLC Number:

P588.245

TAN Cong, LIU Ce, WANG Tongshan, LI Qiufen, ZHU Xi, FU Jinglong, JIANG Hua. Study on Structural Dolomitization:Taking the Yingshan Formation of the Penglaiba Section in Aksu Area as An Example[J]. Geoscience, 2023, 37(05): 1182-1193.

Figures/Tables 13

References 45

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样品编号	岩性	δ¹³C(‰)	δ¹⁸O(‰)
DPL-4	灰岩	-0.4	-6.4
DPL-5	灰岩	-0.8	-7.3
DPL-6	灰岩	-2.1	-6.1
DPL-8	灰岩	-1.8	-7.0
DPL-9	灰岩	0.8	-12.7
DPL-14	灰岩	-1.9	-8.0
DPL-15	云质灰岩	-1.2	-3.7
DPL-16	灰岩	-1.8	-7.1
DPL1-1	白云岩	-0.5	-7.1
DPL4-1	云质灰岩	-0.8	-4.7
DPL5-1	灰岩	-1.1	-7.1
DPL5-3	含灰云岩	-1.5	-7.9
DPL6-1	云质灰岩	-0.7	-5.3
DPL6-2	云质灰岩	-0.3	-7.7
DPL12-1	含云灰岩	-1.5	-7.4
DPL11-B	灰岩	-1.1	-14.2
DPL-F	充填方解石	-1.2	-14.7
DPL-1	灰岩	-0.7	-7.2
DPL-3	灰岩	-1.1	-4.6
DPL-7	云质灰岩	-1.0	-5.0
DPL-10	灰岩	-0.2	-10.8
DPL-11	灰岩	-1.1	-15.1
DPL0-1	白云岩	-0.6	-5.3
DPL2-1	白云岩	-0.6	-3.6
DPL4-2	白云岩	-0.9	-5.6
DPL5-2	含云灰岩	-1.6	-7.0
DPL5-4	云质灰岩	-0.8	-4.4

样品编号	岩性	δ¹³C(‰)	δ¹⁸O(‰)
DPL-4	灰岩	-0.4	-6.4
DPL-5	灰岩	-0.8	-7.3
DPL-6	灰岩	-2.1	-6.1
DPL-8	灰岩	-1.8	-7.0
DPL-9	灰岩	0.8	-12.7
DPL-14	灰岩	-1.9	-8.0
DPL-15	云质灰岩	-1.2	-3.7
DPL-16	灰岩	-1.8	-7.1
DPL1-1	白云岩	-0.5	-7.1
DPL4-1	云质灰岩	-0.8	-4.7
DPL5-1	灰岩	-1.1	-7.1
DPL5-3	含灰云岩	-1.5	-7.9
DPL6-1	云质灰岩	-0.7	-5.3
DPL6-2	云质灰岩	-0.3	-7.7
DPL12-1	含云灰岩	-1.5	-7.4
DPL11-B	灰岩	-1.1	-14.2
DPL-F	充填方解石	-1.2	-14.7
DPL-1	灰岩	-0.7	-7.2
DPL-3	灰岩	-1.1	-4.6
DPL-7	云质灰岩	-1.0	-5.0
DPL-10	灰岩	-0.2	-10.8
DPL-11	灰岩	-1.1	-15.1
DPL0-1	白云岩	-0.6	-5.3
DPL2-1	白云岩	-0.6	-3.6
DPL4-2	白云岩	-0.9	-5.6
DPL5-2	含云灰岩	-1.6	-7.0
DPL5-4	云质灰岩	-0.8	-4.4

编号	Si(%)	Al(%)	MgO(%)	CaO(%)	Na(%)	K(%)	MnO(%)	Ti(%)	P(%)	FeO(%)	Sr(μg/g)	层位
DPL-1	1.34	0.123	19.91	32.11	0.035	0.036	0.017	0.007	0.012	<0.10	147.0	蓬莱坝组
DPL-7	2.89	0.774	10.08	41.69	0.035	0.244	0.005	0.045	0.011	0.33	121.0	鹰山组
DPL-15	2.86	0.927	15.51	35.11	0.032	0.303	0.009	0.059	0.012	0.24	129.0	鹰山组
DPL0-1	2.67	0.151	19.10	32.27	0.047	0.048	0.004	0.015	0.01	<0.10	231.0	蓬莱坝组
DPL2-1	5.73	0.863	15.85	33.10	0.040	0.260	0.012	0.056	0.020	0.54	137.0	鹰山组
DPL4-1	5.72	1.540	16.95	31.24	0.095	0.501	0.010	0.086	0.013	0.45	110.0	鹰山组
DPL4-2	7.19	1.040	13.73	34.30	0.058	0.326	0.012	0.057	0.016	0.58	96.4	鹰山组
DPL6-2	3.21	0.559	18.06	31.44	0.083	0.179	0.013	0.039	0.014	0.67	69.9	鹰山组
DPL12-1	1.98	0.554	10.10	42.23	0.044	0.168	0.006	0.031	0.008	0.20	138.0	鹰山组

编号	Si(%)	Al(%)	MgO(%)	CaO(%)	Na(%)	K(%)	MnO(%)	Ti(%)	P(%)	FeO(%)	Sr(μg/g)	层位
DPL-1	1.34	0.123	19.91	32.11	0.035	0.036	0.017	0.007	0.012	<0.10	147.0	蓬莱坝组
DPL-7	2.89	0.774	10.08	41.69	0.035	0.244	0.005	0.045	0.011	0.33	121.0	鹰山组
DPL-15	2.86	0.927	15.51	35.11	0.032	0.303	0.009	0.059	0.012	0.24	129.0	鹰山组
DPL0-1	2.67	0.151	19.10	32.27	0.047	0.048	0.004	0.015	0.01	<0.10	231.0	蓬莱坝组
DPL2-1	5.73	0.863	15.85	33.10	0.040	0.260	0.012	0.056	0.020	0.54	137.0	鹰山组
DPL4-1	5.72	1.540	16.95	31.24	0.095	0.501	0.010	0.086	0.013	0.45	110.0	鹰山组
DPL4-2	7.19	1.040	13.73	34.30	0.058	0.326	0.012	0.057	0.016	0.58	96.4	鹰山组
DPL6-2	3.21	0.559	18.06	31.44	0.083	0.179	0.013	0.039	0.014	0.67	69.9	鹰山组
DPL12-1	1.98	0.554	10.10	42.23	0.044	0.168	0.006	0.031	0.008	0.20	138.0	鹰山组

编号	层位	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	∑REE	LREE	HREE	LREE/ HREE	δEu	δCe
DPL-1	蓬莱坝组	1.02	2.16	0.23	0.95	0.18	0.03	0.18	0.04	0.17	0.04	0.09	0.02	0.09	0.01	5.21	4.58	0.64	7.19	0.58	12.37
DPL-7	鹰山组	3.56	6.66	0.77	3.06	0.59	0.10	0.49	0.09	0.48	0.09	0.25	0.05	0.28	0.03	16.49	14.73	1.77	8.34	0.54	15.48
DPL-15	鹰山组	3.86	7.19	0.81	3.12	0.62	0.10	0.54	0.10	0.53	0.11	0.31	0.06	0.32	0.05	17.71	15.70	2.01	7.82	0.54	14.60
DPL0-1	蓬莱坝组	0.74	1.47	0.17	0.73	0.15	0.03	0.13	0.02	0.12	0.03	0.08	0.01	0.07	0.01	3.76	3.30	0.46	7.10	0.56	12.66
DPL2-1	鹰山组	6.24	12.5	1.35	5.38	1.01	0.18	0.86	0.17	1.02	0.20	0.53	0.10	0.56	0.08	30.18	26.66	3.51	7.59	0.59	12.90
DPL4-1	鹰山组	7.04	13.4	1.42	5.54	1.02	0.18	0.87	0.16	0.86	0.17	0.53	0.09	0.49	0.07	31.83	28.60	3.23	8.87	0.58	15.27
DPL4-2	鹰山组	5.26	11.3	1.32	5.34	1.04	0.20	0.91	0.16	0.85	0.17	0.46	0.07	0.44	0.07	27.59	24.46	3.13	7.81	0.60	12.96
DPL6-2	鹰山组	3.38	6.46	0.73	2.96	0.56	0.10	0.52	0.09	0.53	0.10	0.28	0.05	0.30	0.04	16.10	14.19	1.91	7.44	0.55	13.61
DPL12-1	鹰山组	2.51	4.89	0.57	2.10	0.43	0.06	0.32	0.06	0.36	0.07	0.21	0.04	0.23	0.03	11.87	10.56	1.32	8.03	0.49	16.43