Application of High-resolution Chemical Sequence Stratigraphy to Deep-water Fine-grained Sediments:A Case Study of Wufeng Formation and Lower Member of Longmaxi Formation in Liutang Outcrop, Upper Yangtze Area

doi:10.19657/j.geoscience.1000-8527.2021.01.28

Abstract

Abstract:

Based on the theories and methods of chemical stratigraphy and sequence stratigraphy, the data of Liutang outcrop profile and sample analysis and test in Shizhu County of Chongqing are used to optimize the indicators system for the chemical sequence stratigraphic division which are the elements assemblages of Al-K-Ti-Rb-Cr-Zr, related to input intensity of terrigenous, the elements assemblages of Ca-Mn-Mg-Ba-Zn, related to autogenetic precipitation intensity, and the elements assemblages of V-Ni-Mo-U-As related to organic matter adsorption and deoxidation intensity. The Wufeng Formation of Liutang outcrop is divided into LCW sequence, and the lower part of Longmaxi Formation is divided into MCL1-1, MCL1-2, MCL1-3, MCL1-4 sequences upwardly. The total amount of major and trace element combinations related to the input intensity of terrigenous source is relatively high near the sequence boundary, but relatively low near the most oceanic flooding surface, which has the cyclic changes characteristics of decreasing-increasing of total elements. However, the total amount of major and trace element assemblages related to autogenetic precipitation, organic matter adsorption and deoxidation intensity are generally lower near the sequence boundary and higher near the maximum flooding surface, which has the cyclic changes characteristics of increasing-decreasing the total amount of elements. The cyclic change characteristics of the total amount of element assemblages with different genetic signi-ficance is the response of regional sea level change, which has regional consistency and can be used as the basis of regional stratigraphic correlation.

Key words: Upper Yangtze area, Liutang outcrop, Wufeng Formation, Longmaxi Formation, chemical sequence stratigraphy

CLC Number:

WANG Qian, HUANG Yongjian, ZHANG Zhifeng, WANG Changhong, LI Xiang, LIU Wei. Application of High-resolution Chemical Sequence Stratigraphy to Deep-water Fine-grained Sediments:A Case Study of Wufeng Formation and Lower Member of Longmaxi Formation in Liutang Outcrop, Upper Yangtze Area[J]. Geoscience, 2021, 35(01): 281-292.

Figures/Tables 9

References 51

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元素(氧化物)	石英	方解石	白云石	伊利石	微斜长石	斜长石	黄铁矿	绿泥石
SiO₂	0.841	-0.766	-0.997	-0.480	-0.240	-0.116	-0.192	-0.407
Al₂O₃	-0.700	0.720	-0.923	0.859	0.342	0.350	-0.239	0.244
Fe₂O₃	-0.731	0.845	0.295	0.577	0.157	0.078	0.165	0.504
CaO	-0.316	0.975	0.995	-0.274	0.024	-0.134	0.037	0.233
MgO	-0.731	0.405	0.998	0.267	0.200	-0.028	-0.212	0.552
K₂O	-0.647	-0.755	-0.947	0.861	0.300	0.314	-0.184	0.205
Na₂O	-0.446	0.268	-0.984	0.190	0.724	0.850	-0.132	-0.136
MnO	-0.321	0.710	0.972	-0.194	-0.043	-0.163	0.107	0.265
TiO₂	-0.660	0.694	-0.934	0.736	0.519	0.566	-0.242	0.046
P₂O₅	-0.265	0.878	0.873	0.037	0.172	0.253	0.438	-0.035
V	0.448	-0.583	-0.129	-0.285	-0.377	-0.345	0.118	-0.151
Cr	0.033	0.893	-0.854	0.199	-0.279	-0.174	-0.048	-0.096
Co	-0.001	-0.461	0.741	-0.204	0.257	0.093	0.334	0.089
Ni	0.112	-0.177	0.500	-0.141	-0.106	-0.091	0.290	-0.028
Zn	-0.398	0.796	-0.756	0.373	0.283	0.205	-0.269	0.180
Cu	0.373	0.135	0.999	-0.313	-0.439	-0.380	0.707	-0.035
Ba	-0.451	0.939	-0.367	0.402	0.208	0.094	-0.143	0.215
La	-0.056	0.282	-0.866	0.382	0.012	0.012	-0.257	0.049
Ce	0.062	0.497	-0.735	0.194	-0.088	-0.030	0.051	-0.095
Zr	-0.207	0.348	-1.000	0.103	0.611	0.664	-0.372	-0.347
Rb	-0.362	0.918	-0.951	0.621	0.096	0.023	-0.112	0.027
As	0.120	0.980	0.741	-0.176	0.118	0.214	0.436	-0.239
Th	-0.193	0.696	-0.866	0.330	0.012	0.085	-0.064	0.053
U	0.163	-0.333	0.010	-0.076	-0.104	-0.085	0.262	0.029
Mo	0.225	0.010	0.010	-0.114	-0.162	-0.127	0.414	0.000

元素(氧化物)	石英	方解石	白云石	伊利石	微斜长石	斜长石	黄铁矿	绿泥石
SiO₂	0.841	-0.766	-0.997	-0.480	-0.240	-0.116	-0.192	-0.407
Al₂O₃	-0.700	0.720	-0.923	0.859	0.342	0.350	-0.239	0.244
Fe₂O₃	-0.731	0.845	0.295	0.577	0.157	0.078	0.165	0.504
CaO	-0.316	0.975	0.995	-0.274	0.024	-0.134	0.037	0.233
MgO	-0.731	0.405	0.998	0.267	0.200	-0.028	-0.212	0.552
K₂O	-0.647	-0.755	-0.947	0.861	0.300	0.314	-0.184	0.205
Na₂O	-0.446	0.268	-0.984	0.190	0.724	0.850	-0.132	-0.136
MnO	-0.321	0.710	0.972	-0.194	-0.043	-0.163	0.107	0.265
TiO₂	-0.660	0.694	-0.934	0.736	0.519	0.566	-0.242	0.046
P₂O₅	-0.265	0.878	0.873	0.037	0.172	0.253	0.438	-0.035
V	0.448	-0.583	-0.129	-0.285	-0.377	-0.345	0.118	-0.151
Cr	0.033	0.893	-0.854	0.199	-0.279	-0.174	-0.048	-0.096
Co	-0.001	-0.461	0.741	-0.204	0.257	0.093	0.334	0.089
Ni	0.112	-0.177	0.500	-0.141	-0.106	-0.091	0.290	-0.028
Zn	-0.398	0.796	-0.756	0.373	0.283	0.205	-0.269	0.180
Cu	0.373	0.135	0.999	-0.313	-0.439	-0.380	0.707	-0.035
Ba	-0.451	0.939	-0.367	0.402	0.208	0.094	-0.143	0.215
La	-0.056	0.282	-0.866	0.382	0.012	0.012	-0.257	0.049
Ce	0.062	0.497	-0.735	0.194	-0.088	-0.030	0.051	-0.095
Zr	-0.207	0.348	-1.000	0.103	0.611	0.664	-0.372	-0.347
Rb	-0.362	0.918	-0.951	0.621	0.096	0.023	-0.112	0.027
As	0.120	0.980	0.741	-0.176	0.118	0.214	0.436	-0.239
Th	-0.193	0.696	-0.866	0.330	0.012	0.085	-0.064	0.053
U	0.163	-0.333	0.010	-0.076	-0.104	-0.085	0.262	0.029
Mo	0.225	0.010	0.010	-0.114	-0.162	-0.127	0.414	0.000

元素	相关矿物	主要成因意义
Si	石英,其他硅酸盐	陆源或自生
Al、Ga	主要是黏土矿物,少量与长石有关	陆源
K、Rb	钾长石、云母和黏土矿物(特别是伊利石)	陆源
Cs、Sc	黏土矿物和长石	陆源
V	主要是黏土矿物,V在缺氧条件下吸附在黏土矿物上	还原
Ca	主要是方解石和白云石,也与石膏和硬石膏有关,少量与蒙脱石和斜长石有关	自生为主
Mg	主要是白云石、方解石和/或黏土矿物(尤其是绿泥石)	自生为主
Fe、Mn	各种黏土和碳酸盐矿物以及黄铁矿	陆源或自生
Na	主要是斜长石,但有些钠与石盐和/或黏土矿物(如蒙脱石)有关	陆源或自生
Ti、Ta、Nb	钛磁铁矿、磁铁矿、钛铁矿、金红石、锐钛矿和/或闪锌矿	陆源
Th	重矿物,特别是独居石、锆石和磷灰石	陆源
REE	轻稀土元素在黏土矿物和长石中最为丰富,而重稀土元素存在于重矿物中	陆源
U	重矿物和有机物,还原环境	陆源或还原
Cr	重矿物,如铬尖晶石	陆源
Zr、Hf	锆石	陆源
P	生物磷、含磷重矿物(磷灰石和独居石),少量磷与碳酸盐和黏土矿物有关	自生
Zn、Ni、Mo、Co、Cu	黄铁矿、氢氧化铁、碳酸盐和/或黏土矿物	自生或陆源
Ba	碳酸盐,如重晶石	自生
Sr	长石、黏土矿物、碳酸盐	陆源或自生

元素	相关矿物	主要成因意义
Si	石英,其他硅酸盐	陆源或自生
Al、Ga	主要是黏土矿物,少量与长石有关	陆源
K、Rb	钾长石、云母和黏土矿物(特别是伊利石)	陆源
Cs、Sc	黏土矿物和长石	陆源
V	主要是黏土矿物,V在缺氧条件下吸附在黏土矿物上	还原
Ca	主要是方解石和白云石,也与石膏和硬石膏有关,少量与蒙脱石和斜长石有关	自生为主
Mg	主要是白云石、方解石和/或黏土矿物(尤其是绿泥石)	自生为主
Fe、Mn	各种黏土和碳酸盐矿物以及黄铁矿	陆源或自生
Na	主要是斜长石,但有些钠与石盐和/或黏土矿物(如蒙脱石)有关	陆源或自生
Ti、Ta、Nb	钛磁铁矿、磁铁矿、钛铁矿、金红石、锐钛矿和/或闪锌矿	陆源
Th	重矿物,特别是独居石、锆石和磷灰石	陆源
REE	轻稀土元素在黏土矿物和长石中最为丰富,而重稀土元素存在于重矿物中	陆源
U	重矿物和有机物,还原环境	陆源或还原
Cr	重矿物,如铬尖晶石	陆源
Zr、Hf	锆石	陆源
P	生物磷、含磷重矿物(磷灰石和独居石),少量磷与碳酸盐和黏土矿物有关	自生
Zn、Ni、Mo、Co、Cu	黄铁矿、氢氧化铁、碳酸盐和/或黏土矿物	自生或陆源
Ba	碳酸盐,如重晶石	自生
Sr	长石、黏土矿物、碳酸盐	陆源或自生

元素 (氧化物)	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	K₂O	Na₂O	MnO	TiO₂	P₂O₅	V	Cr	Co	Ni	Zn	Cu	Ba	La	Ce	Zr	Rb	As	Th	U	Mo
SiO₂	1.00
Al₂O₃	-0.66	1.00
Fe₂O₃	-0.73	0.52	1.00
CaO	-0.43	-0.23	0.15	1.00
MgO	-0.82	0.53	0.68	0.59	1.00
K₂O	-0.64	0.96	0.44	-0.24	0.44	1.00
Na₂O	-0.04	0.23	0.04	-0.09	0.10	0.10	1.00
MnO	-0.43	-0.15	0.30	0.83	0.61	-0.23	0.05	1.00
TiO₂	-0.59	0.88	0.35	-0.20	0.37	0.91	0.25	-0.25	1.00
P₂O₅	-0.30	0.01	0.39	0.14	0.17	-0.04	0.37	0.27	0.07	1.00
V	0.17	-0.39	-0.17	-0.04	-0.35	-0.23	-0.47	-0.16	-0.23	-0.08	1.00
Cr	-0.33	0.49	0.20	-0.19	0.16	0.54	-0.19	-0.24	0.52	-0.07	0.16	1.00
Co	0.11	-0.25	0.17	0.09	0.02	-0.33	0.22	0.26	-0.41	0.15	-0.10	-0.30	1.00
Ni	-0.08	-0.29	0.28	0.10	-0.14	-0.20	-0.21	0.04	-0.17	0.31	0.61	0.05	0.14	1.00
Zn	-0.35	0.35	0.61	-0.05	0.33	0.31	0.19	0.02	0.34	0.26	-0.04	0.22	0.06	0.35	1.00
Cu	0.07	-0.23	-0.02	0.04	-0.12	-0.22	-0.38	0.03	-0.24	0	0.23	0.23	-0.07	0.24	-0.13	1.00
Ba	-0.51	0.60	0.39	-0.08	0.39	0.64	0.05	-0.10	0.62	-0.05	-0.03	0.43	-0.22	-0.03	0.38	-0.14	1.00
La	-0.08	0.30	0.08	-0.33	-0.05	0.31	-0.01	-0.27	0.24	-0.09	0.00	0.33	-0.13	0.03	0.20	0	0.21	1.00
Ce	-0.10	0.29	-0.07	-0.18	-0.03	0.32	-0.12	-0.20	0.29	-0.17	0.04	0.49	-0.23	-0.12	-0.05	0.06	0.11	0.13	1.00
Zr	-0.12	0.40	-0.05	-0.16	0.02	0.39	0.56	-0.22	0.61	0.07	-0.26	0.14	-0.23	-0.18	0.16	-0.27	0.29	0.09	0.11	1.00
Rb	-0.53	0.81	0.35	-0.23	0.34	0.85	-0.01	-0.23	0.77	-0.13	-0.14	0.53	-0.39	-0.17	0.29	-0.08	0.62	0.29	0.37	0.35	1.00
As	-0.14	0.03	-0.05	-0.03	-0.15	0.16	0.01	-0.15	0.26	0.14	0.25	0.20	-0.14	0.28	0.06	0.06	0.23	0.03	0.14	0.27	0.19	1.00
Th	-0.19	0.32	0.02	-0.09	0.09	0.36	0.05	-0.15	0.36	-0.08	-0.06	0.25	-0.18	-0.14	0.05	-0.04	0.19	0.14	0.29	0.21	0.35	0.11	1.00
U	0.01	-0.23	0.03	-0.06	-0.25	-0.13	-0.19	-0.07	-0.14	0.16	0.56	0.00	0.03	0.57	0.04	0.14	-0.02	0.05	-0.06	-0.09	-0.01	0.24	-0.04	1.00
Mo	0.14	-0.39	-0.19	-0.02	-0.37	-0.28	-0.28	-0.06	-0.31	-0.06	0.59	-0.13	0.04	0.41	-0.17	0.13	-0.17	0.02	0	-0.21	-0.22	0.23	-0.09	0.46	1.00