Exploration Discovery of Shale Gas and Its Indicative Significance to Mineralization of MVT Lead-Zinc Deposit in Yichang Area, West Hubei
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摘要: 油气成藏和有机质参与金属成矿的内在联系是近年来国内外地学界关注的热点问题.根据流体包裹体岩相学观察和激光拉曼光谱分析，在鄂西宜昌地区震旦系陡山沱组和下寒武统牛蹄塘组页岩储层及震旦系灯影组MVT（Mississippi Valley type）铅锌矿床中发现了高密度甲烷包裹体，并利用甲烷包裹体的甲烷拉曼散射峰v1计算了甲烷包裹体的密度；同时采用Rb-Sr、Sm-Nd同位素定年确定了MVT铅锌矿成矿年代.鄂阳页1井陡山沱组页岩石英脉和何家坪MVT铅锌矿方解石样品中甲烷包裹体密度分别为0.237~0.278 g/cm3和0.213~0.271 g/cm3，属于高密度甲烷包裹体.何家坪铅锌矿共生矿物闪锌矿和方铅矿的Rb-Sr等时线年龄为189.1±1.8 Ma，方解石的Sm-Nd等时线年龄为189.9±2.0 Ma，指示铅锌矿形成于燕山早期的构造挤压运动；共生矿物的初始87Sr/86Sr值（0.711 92）和方解石的初始87Sr/86Sr值（0.712 03~0.712 27）指示何家坪铅锌矿成矿流体的Sr同位素主要来源于页岩层.何家坪铅锌矿中捕获的以流体包裹体形式存在的高密度甲烷流体最有可能来源于陡山沱组页岩和/或牛蹄塘组页岩内高密度超压甲烷流体.页岩气层和MVT铅锌矿中高密度甲烷包裹体的发现及MVT铅锌矿成矿时间的确定为探讨有机质参与MVT铅锌矿成矿提供了新证据.
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关键词:
- 页岩气 /
- MVT铅锌矿 /
- 高密度甲烷包裹体 /
- Rb-Sr等时线定年 /
- Sm-Nd等时线定年 /
- 成矿-成藏耦合 /
- 石油地质
Abstract: The coupling relationship between hydrocarbon accumulation and the involvement of organic matter in metal mineralization has been a frontier scientific question in recent years. On the basis of the petrography and Raman spectral analysis of fluid inclusions, high-density methane inclusions were discovered in the samples of quartz and calcite veins from Sinian Doushantuo shales, Lower Cambrian Niutitang shales, and MVT (Mississippi Valley type) lead-zinc deposit of Sinian Dengying Formation in Yichang area. The Raman scatter peak v1 of methane inclusions was applied to calculate the density of pure methane inclusions, and the ore-forming ages of MVT lead-zinc deposit were determined by using Rb-Sr and Sm-Nd isochron dating. The density of methane inclusions trapped in the quartz veins within the Doushantuo shales of well EYY 1 mainly ranges from 0.237 to 0.278 g/cm3, and the density of methane inclusions trapped in the calcite veins within the Hejiaping MVT lead-zinc deposit mainly ranges from 0.213 to 0.271 g/cm3, which signifies methane inclusions of high density. Paragenetic mineral association sphalerite and galena within the Hejiaping lead-zinc deposit have a Rb-Sr isochron age of 189.1±1.8 Ma, and calcite within the Hejiaping lead-zinc deposit yields a Sm-Nd isochron age of 189.9±2.0 Ma, which indicates is the mineralization of Hejiaping lead-zinc deposit was closely related to the Yanshanian tectonic compressions. The 87Sr/86Sr values of the paragenetic mineral association (0.711 92) and calcite (0.712 03-0.712 27) indicate that the ore-forming fluids of the Hejiaping lead-zinc deposit were derived largely from shale sources. The high-density methane trapped in fluid inclusions within the Hejiaping lead-zinc deposit was most likely derived from the high-density overpressure methane generated by the Doushantuo shales and/or Niutitang shales. The discovery of high-density methane inclusion in the shale gas layer and MVT lead-zinc deposit, and the determination of ore-forming ages of MVT lead-zinc deposit provide new evidence for the study of organic matter participation in the mineralization of MVT lead-zinc deposit. -
图 1 中扬子宜昌地区区域地质概况及采样位置图(修改自罗胜元等，2019b)
Fig. 1. Geological map and sampling location of the Yichang area, Middle Yangtze region(modified from Luo et al., 2019b)
图 2 鄂西宜昌地区鄂阳页1井震旦系-下寒武统地层综合柱状图
Fig. 2. Stratigraphic column of the Sinian-Lower Cambrian section of well EYY-1 in Yichang area
图 3 鄂西宜昌地区鄂阳页1井页岩裂缝脉体样品和何家坪铅锌矿样品照片
a.鄂阳页1井寒武系牛蹄塘组页岩高角度裂缝充填的方解石脉，EYY-1，2 942.56 m；b.鄂阳页1井震旦系陡山陀组页岩高角度裂缝充填的石英脉，EYY-2，3 392.42 m；c.震旦系灯影组何家坪铅锌矿床含方铅矿闪锌矿型样品，HJP1，Ⅰ号矿体；d.震旦系灯影组何家坪铅锌矿床闪锌矿型样品，HJP3，Ⅰ号矿体
Fig. 3. Photos of calcite and quartz veins hosted in well EYY-1 and samples from Hejiaping lead-zinc deposit in Yichang area, West Hubei
图 4 宜昌地区鄂阳页1井页岩裂缝脉体和何家坪铅锌矿方解石捕获甲烷包裹体特征
a.为方解石脉中散布的甲烷包裹体和气-液两相盐水包裹体，牛蹄塘组，EYY-1井，2 942.56 m；b~d为石英脉中共生分布的甲烷包裹体、气-液两相盐水包裹体和沥青包裹体，陡山陀组，EYY-1井，3 392.42 m；e、f.方解石中散布的甲烷包裹体和气-液两相盐水包裹体，灯影组，何家坪铅锌矿，Ⅰ号矿体
Fig. 4. Methane inclusions and their coexisting aqueous inclusions trapped in quartz and calcite veins from well EYY-1 and Hejiaping lead-zinc deposit in Yichang area
图 5 宜昌地区鄂阳页1井页岩裂缝脉体(a、b)和何家坪铅锌矿方解石(c~e)中流体包裹体激光拉曼光谱图
Fig. 5. Laser Raman spectra for fluid inclusion trapped in quartz veins from well EYY1 (a, b) and calcite from Hejiaping lead-zinc deposit (c-e) in Yichang area
图 6 宜昌地区鄂阳页1井页岩裂缝脉体和何家坪铅锌矿方解石中甲烷包裹体密度分布(a)和捕获温度、压力分布(b)
Fig. 6. The density histogram of methane inclusions (a), and relationship of trapping temperatures and pressures of methane inclusions (b) trapped in quartz from well EYY-1 and calcite from Hejiaping lead-zinc deposit, Yichang area
图 7 何家坪铅锌矿共生矿物闪锌矿和方铅矿的Rb-Sr等时线年龄(a)和方解石的Sm-Nd等时线年龄(b)
Fig. 7. Rb-Sr isochron dating of paragenetic mineral association sphalerite and galena (a), and Sm-Nd isochron dating of calcites (b) from the Hejianping lead-zinc deposit
图 8 宜昌地区鄂阳页1井埋藏史-热史重建
Fig. 8. Modeling results of burial and thermal maturity histories of well EYY-1 in Yichang area
表 1 宜昌地区鄂阳页1井页岩裂缝脉体和何家坪铅锌矿样品信息
Table 1. Details of samples selected from veins in well EYY1 and from Hejiaping lead-zinc deposit, Yichang area
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表 2 宜昌地区鄂阳页1井页岩裂缝脉体和何家坪铅锌矿方解石中甲烷包裹体甲烷拉曼散射峰v1、密度、捕获温度和压力分布
Table 2. Measured peak positions (v1), calculated densities (ρ), and the trapping temperatures and pressures of methane inclusions in quartz and calcite veins from well EYY-1 and Hejiaping lead-zinc deposit in Yichang area
样品 甲烷拉曼散射峰v1范围
(cm-1)测点数
(个)甲烷包裹体密度
ρ(g/cm3)共生气-液两相盐水包裹体均一温度
Th(℃)甲烷包裹体捕获压力
P(MPa)鄂阳页1井页岩石英脉样品 2 910.937 5~2 911.121 0 2 0.261~0.271 179.8~182.9 96.6~106.2 2 910.779 3~2 911.121 0 4 0.261~0.278 185.1~186.3 98.9~113.1 2 910.779 3~2 911.467 9 4 0.244~0.278 189 86.9~114.2 2 911.106 0~2 911.613 5 3 0.237~0.261 195.4~197.1 84.4~102.4 2 910.779 3~2 910.937 5 2 0.271~0.278 210.2 115.5~122.2 何家坪铅锌矿方解石样品 2 910.918 7 1 0.271 193.3 109.8 2 911.105 5~2 911.613 5 3 0.238~0.262 206.9~215.8 87.3~109.1 2 911.266 0~2 911.613 5 3 0.238~0.254 223.5 91.7~104.8 2 911.266 0 1 0.254 227.3 105.9 2 912.134 7 1 0.213 232.2 77.5
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表 3 宜昌地区何家坪铅锌矿共生矿物闪锌矿和方铅矿的Rb-Sr同位素组成和方解石Sm-Nd同位素组成
Table 3. Results of Rb-Sr isotopic compositions of paragenetic mineral association sphalerite and galena, and Sm-Nd isotopic compositions of calcites from the Hejianping lead-zinc deposit in Yichang area
样品号 矿物 Rb
(10-6)Sr
(10-6)87Rb/86Sr 87Sr/86Sr±2σ εSr
(189 Ma)Sm
(10-6)Nd
(10-6)147Sm/144Nd 143Nd/144Nd±2σ 共生矿物闪锌矿和方铅矿，图 7a HJP1-1 方铅矿 0.115 8 4.716 0 0.072 9 0.712 052±7 0.711 86 HJP1-2 闪锌矿 0.380 7 0.349 5 3.218 0 0.720 678±8 0.712 20 HJP2 闪锌矿 0.421 9 0.627 8 1.983 0 0.717 292±9 0.712 06 HJP3-1 闪锌矿 0.873 6 0.445 3 5.782 0 0.727 411±9 0.712 13 HJP4-1 闪锌矿 0.673 1 0.495 1 4.015 0 0.722 698±9 0.712 11 与铅锌矿矿石密伴生的方解石，图 7b HJP1-3 方解石 7.903 0 98.47 0.237 8 0.712 799±8 0.712 17 0.120 5 0.213 8 0.342 9 0.512 482±9 HJP3-2 方解石 3.692 0 95.61 0.114 6 0.712 329±8 0.712 03 0.152 6 0.311 4 0.295 2 0.512 421±7 HJP4-2 方解石 0.271 8 87.24 0.092 7 0.712 293±7 0.712 27 0.311 2 0.236 5 0.794 3 0.513 042±7
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