Development Characteristics and Model of Cili Longwang Karst Cave in Hunan Province

doi:10.7657/XJPG20220203

Abstract

Abstract:

To study the development characteristics and model of the Longwang Cave in the Cili area of Hunan province, a 3D model is constructed by using manual survey and 3D laser scanning technology to characterize the structure of the karst cave. The Longwang Cave can be divided into three sections. The western section is NEE-SWW trending and filled with chemical cements. The middle section is NNE-SSW trending and filled with collapsed cements. The eastern section is nearly EW trending, and filled with chemical cements and flowing water deposits. As for the filling degree, the middle section shows the highest, the western section is higher, and the eastern section is the lowest. Controlled by a NEE-SWW trending fracture zone, the Longwang Cave is a typical fracture-controlled karst cave which has undergone four development stages. First, a NEE-SWW fracture zone was formed along the Sanguansi syncline. Then the rock was dissolved along the fracture zone by karst water from west to east, and an initial karst cave formed. Second, the initial karst cave was dislocated by NNW-SSE trending strike-slip thrust faults and then differential dissolution occured, that is, the western section was dissolved to a higher degree than the middle and eastern sections. Third, due to different numbers and scales of fractures, differential dissolution made the carst caves in the western section further expand, and the karst caves in the eastern section gradually connected together. The dissolution of the western section was higher than that of the eastern section. Finally, the middle section inherited the previous dissolution characteristics, so it is weaker than the eastern and western sections in dissolution. After the four stages above, the Longwang Cave shows its present structure.

Key words: Cili Longwang Cave, fracture-controlled karst cave, development characteristic, development model, 3D laser scanning technology, section, correlation, controlling factor

CLC Number:

P642.25

XU Xinyu, CHEN Qinghua, JI Dongsheng, CUI Youwei. Development Characteristics and Model of Cili Longwang Karst Cave in Hunan Province[J]. Xinjiang Petroleum Geology, 2022, 43(2): 145-152.

Figures/Tables 8

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Fig. 2.

Table 1

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Table 2

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Fig. 6.

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扫描站点	石钟乳数量/个	平均长度/m	扫描站点	石钟乳数量/个	平均长度/m
Scan011	4	3.56	Scan036	3	1.63
Scan012	5	4.39	Scan037	1	6.67
Scan013	11	3.19	Scan038	4	2.01
Scan014	2	2.32	Scan039	3	3.05
Scan015	5	1.99	Scan040	7	3.93
Scan016	10	3.18	Scan041	3	3.08
Scan017	4	3.45	Scan042	3	7.47
Scan018	3	3.75	Scan044	6	4.01
Scan019	7	3.74	Scan045	2	4.75
Scan020	10	1.90	Scan046	15	1.91
Scan021	5	3.10	Scan047	17	2.79
Scan022	0	0	Scan048	5	1.83
Scan023	0	0	Scan049	4	4.38
Scan025	5	3.45	Scan050	9	7.25
Scan027	8	2.58	Scan051	4	13.47
Scan028	2	1.49	Scan052	2	15.87
Scan029	2	0.77	Scan053	5	7.83
Scan030	3	0.82	Scan054	2	5.35
Scan031	7	1.37	Scan055	23	2.36
Scan033	7	1.43	Scan056	22	1.64
Scan034	2	1.62	Scan057	22	1.87
Scan035	1	5.17