Geochemical Characteristics and Genetic Interpretation of Laminated Shales of the Third Member of Hetaoyuan Formation in the Biyang Depression of Nanxiang Basin

doi:10.19657/j.geoscience.1000-8527.2018.01.13

Abstract

Abstract:

The occurence of black and white stripes of laminated shales is a very important and common phenomenon in sedimentary rocks. The X-ray fluorescence core scanner has been used for testing laminated shale samples from the fifth layer in the Biyang Depression. The analysis results show that some chemical elements of the lacustrine lamina, such as Sr, CaO, K₂O, SiO₂, TiO₂, Fe₂O₃, Al₂O₃ and Cu, show obvious regular changes in the black and white laminae. That is, the Sr and CaO contents in the white laminae are significantly higher than those in the black laminae, and the contents of K₂O, SiO₂, TiO₂, Fe₂O₃, Al₂O₃ and Cu in the black laminae are significantly higher than those in the white laminae. The formation machanism of laminae is analyzed combined with the boron element and paleoredox proxies and paleoclimate proxies, and the result suggests that these laminated shales would have mainly developed in the brackish-saline and semiarid-arid stratified water. Microscopic investigation also reveals that the black stripes are mainly composed of a high proportion of organic matters and argillaceous sediments, while white stripes are mainly composed of the calcite, gypsum, quartz, dolomite and other minerals. The black and white laminated material components are closely related with a terrigenous supply and authigenic minerals formed in a saline enviroment. The occurence of different elements between the black and the white reveals the different mineral compositions as well as seasonal rhythm changes in the continental lake basin. Therefore, core scanning provides a new effective method to evaluate geochemical characteristics of the laminated shale and its formation mechanism.

Key words: laminated shale, lacustrine laminae, Hetaoyuan Formation, Biyang depression

CLC Number:

TE121.3

GUO Laiyuan, LIU Zhengjun, XIE Xinong. Geochemical Characteristics and Genetic Interpretation of Laminated Shales of the Third Member of Hetaoyuan Formation in the Biyang Depression of Nanxiang Basin[J]. Geoscience, 2018, 32(01): 133-144.

Figures/Tables 12

References 38

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样品	Sr	CaO	K₂O	SiO₂	TiO₂	Fe₂O₃	Al₂O₃	Cu
BYHF-1	(0.24 2 0~ 0.051 6)/ 0.108 7	(12.459 3~ 4.558 9)/ 8.398 2	(0.389 7~ 0.119 7)/ 0.257 8	(9.823 2~ 5.486 2)/ 7.633 5	(0.073 2~ 0.019 6)/ 0.045 7	(1.303 6~ 0.271 7)/ 0.723 8	(3.312 0~ 1.257 1)/ 2.467 4	(0.002 5~ 0.001 7)/ 0.002 12
BYHF-2	(0.045 5~ 0.016 1)/ 0.029 2	(7.119 1~ 1.874 9)/ 4.104 2	(0.560 1~ 0.188 8)/ 0.313 7	(17.768 0~ 11.364 0)/ 14.121 1	(0.102 2~ 0.030 8)/ 0.055 2	(1.766 3~ 0.539 7)/ 0.930 0	(3.794 7~ 1.251 5)/ 2.473 4	(0.003 9~ 0.001 7)/ 0.002 4
BYHF-3	(0.119 1~ 0.028 8)/ 0.045 9	(8.459 6~ 3.582 1)/ 5.342 1	(0.283 9~ 0.101 6)/ 0.197 4	(16.46 4~ 10.093 0)/ 13.732 2	(0.054 4~ 0.018 4)/ 0.036 8	(1.159 8~ 0.509 9)/ 0.800 9	(2.576 5~ 0.824 3)/ 1.788 9	(0.002 9~ 0.001 4)/ 0.002 3
BYHF-4	(0.120 0~ 0.001 91)/ 0.044 6	(6.891 3~ 2.982 8)/ 4.981 4	(0.742 7~ 0.120 0)/ 0.218 0	(17.108 7~ 11.575 8)/ 13.991 6	(0.103 8~ 0.021 2)/ 0.041 0	(0.871 9~ 0.446 2)/ 0.871 9	(4.081 9~ 0.867 0)/ 1.952 0	(0.003 6~ 0.001 7)/ 0.002 3
BYHF-5	(0.153 6~ 0.016 4)/ 0.045 5	(16.301 9~ 1.504 6)/ 4.581 3	(0.642 4~ 0.034 1)/ 0.405 2	(21.602 3~ 2.679 0)/ 13.070 0	(0.141 3~ 0.004 8)/ 0.083 8	(3.130 0~ 0.268 1)/ 1.127 3	(4.871 5~ 1.169 1)/ 3.296 7	(0.003 2~ 0.001 6)/ 0.002 5

样品	Sr	CaO	K₂O	SiO₂	TiO₂	Fe₂O₃	Al₂O₃	Cu
BYHF-1	(0.24 2 0~ 0.051 6)/ 0.108 7	(12.459 3~ 4.558 9)/ 8.398 2	(0.389 7~ 0.119 7)/ 0.257 8	(9.823 2~ 5.486 2)/ 7.633 5	(0.073 2~ 0.019 6)/ 0.045 7	(1.303 6~ 0.271 7)/ 0.723 8	(3.312 0~ 1.257 1)/ 2.467 4	(0.002 5~ 0.001 7)/ 0.002 12
BYHF-2	(0.045 5~ 0.016 1)/ 0.029 2	(7.119 1~ 1.874 9)/ 4.104 2	(0.560 1~ 0.188 8)/ 0.313 7	(17.768 0~ 11.364 0)/ 14.121 1	(0.102 2~ 0.030 8)/ 0.055 2	(1.766 3~ 0.539 7)/ 0.930 0	(3.794 7~ 1.251 5)/ 2.473 4	(0.003 9~ 0.001 7)/ 0.002 4
BYHF-3	(0.119 1~ 0.028 8)/ 0.045 9	(8.459 6~ 3.582 1)/ 5.342 1	(0.283 9~ 0.101 6)/ 0.197 4	(16.46 4~ 10.093 0)/ 13.732 2	(0.054 4~ 0.018 4)/ 0.036 8	(1.159 8~ 0.509 9)/ 0.800 9	(2.576 5~ 0.824 3)/ 1.788 9	(0.002 9~ 0.001 4)/ 0.002 3
BYHF-4	(0.120 0~ 0.001 91)/ 0.044 6	(6.891 3~ 2.982 8)/ 4.981 4	(0.742 7~ 0.120 0)/ 0.218 0	(17.108 7~ 11.575 8)/ 13.991 6	(0.103 8~ 0.021 2)/ 0.041 0	(0.871 9~ 0.446 2)/ 0.871 9	(4.081 9~ 0.867 0)/ 1.952 0	(0.003 6~ 0.001 7)/ 0.002 3
BYHF-5	(0.153 6~ 0.016 4)/ 0.045 5	(16.301 9~ 1.504 6)/ 4.581 3	(0.642 4~ 0.034 1)/ 0.405 2	(21.602 3~ 2.679 0)/ 13.070 0	(0.141 3~ 0.004 8)/ 0.083 8	(3.130 0~ 0.268 1)/ 1.127 3	(4.871 5~ 1.169 1)/ 3.296 7	(0.003 2~ 0.001 6)/ 0.002 5

样品	Sr	CaO	K₂O	SiO₂	TiO₂	Fe₂O₃	Al₂O₃	Cu
BYHF-1	(0.341 0~ 0.02)/ 0.054 4	(12.634 7~ 0.102 5)/ 2.736 2	(0.697 9~ 0.124 0)/ 0.501 0	(16.480 6~ 5.449 2) /11.978 8	(0.146 6~ 0.021 4) /0.103 6	(2.203 0~ 0.266 6) /1.144 5	(6.166 1~ 1.303 4) /4.037 1	(0.003 0~ 0.001 7) /0.002 4
BYHF-2	(0.036 9~ 0.017 6)/ 0.026 4	(6.491 0~ 1.729 3)/ 3.390 8	(0.569 3~ 0.194 6)/ 0.332 9	(17.770 3~ 11.636 3)/ 14.777 2	(0.133 2~ 0.035 5)/ 0.056 4	(2.368 6~ 0.548 2)/ 0.998 3	(4.45 8~ 0.680 2)/ 2.968 9	(0.004 8~ 0.001 7)/ 0.002 6
BYHF-3	(0.056 7~ 0.030 6)/ 0.040 6	(7.374 0~ 2.835 0)/ 4.463 5	(0.301 2~ 0.115 8)/ 0.222 4	(16.826 1~ 10.585 7)/ 14.248 1	(0.067 5~ 0.019 1)/ 0.043 2	(1.310 6~ 0.572 6)/ 0.948 1	(2.644 6~ 1.020 7)/ 1.885 3	(0.003 0~ 0.001 7)/ 0.002 4
BYHF-4	(0.056 4~ 0.017 3)/ 0.037 5	(6.410 3~ 1.887 9)/ 4.147 8	(0.753 6~ 0.151 1)/ 0.249 4	(17.760 4~ 12.554 3)/ 14.668 8	(0.109 4~ 0.025 4)/ 0.048 8	(1.626 7~ 0.617 1)/ 0.967 6	(4.422 8~ 1.097 4)/ 2.119 7	(0.003 8~ 0.001 7)/ 0.002 6
BYHF-5	(0.073 1~ 0.016 3)/ 0.028 7	(6.989 8~ 1.338 8)/ 2.762 1	(0.671 6~ 0.263 4)/ 0.477 6	(18.194 6~ 10.560 0)/ 14.047 8	(0.151 8~ 0.037 9)/ 0.092 1	(3.584 8~ 0.721 7)/ 1.437 1	(4.954 5~ 2.272 3)/ 3.446 6	(0.003 3~ 0.002 1/ 0.002 9

样品	Sr	CaO	K₂O	SiO₂	TiO₂	Fe₂O₃	Al₂O₃	Cu
BYHF-1	(0.341 0~ 0.02)/ 0.054 4	(12.634 7~ 0.102 5)/ 2.736 2	(0.697 9~ 0.124 0)/ 0.501 0	(16.480 6~ 5.449 2) /11.978 8	(0.146 6~ 0.021 4) /0.103 6	(2.203 0~ 0.266 6) /1.144 5	(6.166 1~ 1.303 4) /4.037 1	(0.003 0~ 0.001 7) /0.002 4
BYHF-2	(0.036 9~ 0.017 6)/ 0.026 4	(6.491 0~ 1.729 3)/ 3.390 8	(0.569 3~ 0.194 6)/ 0.332 9	(17.770 3~ 11.636 3)/ 14.777 2	(0.133 2~ 0.035 5)/ 0.056 4	(2.368 6~ 0.548 2)/ 0.998 3	(4.45 8~ 0.680 2)/ 2.968 9	(0.004 8~ 0.001 7)/ 0.002 6
BYHF-3	(0.056 7~ 0.030 6)/ 0.040 6	(7.374 0~ 2.835 0)/ 4.463 5	(0.301 2~ 0.115 8)/ 0.222 4	(16.826 1~ 10.585 7)/ 14.248 1	(0.067 5~ 0.019 1)/ 0.043 2	(1.310 6~ 0.572 6)/ 0.948 1	(2.644 6~ 1.020 7)/ 1.885 3	(0.003 0~ 0.001 7)/ 0.002 4
BYHF-4	(0.056 4~ 0.017 3)/ 0.037 5	(6.410 3~ 1.887 9)/ 4.147 8	(0.753 6~ 0.151 1)/ 0.249 4	(17.760 4~ 12.554 3)/ 14.668 8	(0.109 4~ 0.025 4)/ 0.048 8	(1.626 7~ 0.617 1)/ 0.967 6	(4.422 8~ 1.097 4)/ 2.119 7	(0.003 8~ 0.001 7)/ 0.002 6
BYHF-5	(0.073 1~ 0.016 3)/ 0.028 7	(6.989 8~ 1.338 8)/ 2.762 1	(0.671 6~ 0.263 4)/ 0.477 6	(18.194 6~ 10.560 0)/ 14.047 8	(0.151 8~ 0.037 9)/ 0.092 1	(3.584 8~ 0.721 7)/ 1.437 1	(4.954 5~ 2.272 3)/ 3.446 6	(0.003 3~ 0.002 1/ 0.002 9