华南地质与矿产
華南地質與礦產
화남지질여광산
Geology and Mineral Resources of South China
2015年
3期
282-290
,共9页
赵又新%杜登文%洪汉烈%王朝文
趙又新%杜登文%洪漢烈%王朝文
조우신%두등문%홍한렬%왕조문
香山寺铅锌矿%包裹体%稳定同位素%矿床成因%湖北京山县
香山寺鉛鋅礦%包裹體%穩定同位素%礦床成因%湖北京山縣
향산사연자광%포과체%은정동위소%광상성인%호북경산현
Xiangshansi Pb-Zn deposit%fluid inclusion%Pb-S isotope%ore genesis%Jinshan,Hubei Province
湖北京山香山寺铅锌矿床赋存于震旦系上统灯影组和寒武系下统下部庄子沟组，矿石类型为碳酸盐岩型和含碳页岩型两种。铅锌矿体受北西向构造控制，襄樊-广济深大断裂为导矿构造，控制着成矿流体的形成和运移，次级的北西向断裂及其破碎带、裂隙为容矿构造。流体包裹体研究显示，成矿流体属于 NaCl-MgCl2-H2O体系，盐度为9.47%~9.98 wt.%NaCleq.，温度为90~128℃，压力为（375.52~400.31）×105 Pa (最小捕获压力)，对应的形成深度为1.25~1.33 km (最小捕获深度)，表明其属于低温浅成热液矿床。矿石硫同位素组成δ34SCDT值变化介于-0.47译~10.16译之间，极差为10.63译，平均值为6.99译。矿石铅同位素组成206Pb/204Pb值在17.842~17.976之间，平均17.923；207Pb/204Pb值在15.577~15.599之间，平均15.586；208Pb/204Pb值在37.786~37.867之间，平均37.834。μ值=9.47~9.51，平均值为9.49。Th/U值=3.69~3.78，平均值为3.72。这些结果表明成矿物质主要是与造山作用有关的深部来源，属于热液成因的充填型铅锌矿床。
湖北京山香山寺鉛鋅礦床賦存于震旦繫上統燈影組和寒武繫下統下部莊子溝組，礦石類型為碳痠鹽巖型和含碳頁巖型兩種。鉛鋅礦體受北西嚮構造控製，襄樊-廣濟深大斷裂為導礦構造，控製著成礦流體的形成和運移，次級的北西嚮斷裂及其破碎帶、裂隙為容礦構造。流體包裹體研究顯示，成礦流體屬于 NaCl-MgCl2-H2O體繫，鹽度為9.47%~9.98 wt.%NaCleq.，溫度為90~128℃，壓力為（375.52~400.31）×105 Pa (最小捕穫壓力)，對應的形成深度為1.25~1.33 km (最小捕穫深度)，錶明其屬于低溫淺成熱液礦床。礦石硫同位素組成δ34SCDT值變化介于-0.47譯~10.16譯之間，極差為10.63譯，平均值為6.99譯。礦石鉛同位素組成206Pb/204Pb值在17.842~17.976之間，平均17.923；207Pb/204Pb值在15.577~15.599之間，平均15.586；208Pb/204Pb值在37.786~37.867之間，平均37.834。μ值=9.47~9.51，平均值為9.49。Th/U值=3.69~3.78，平均值為3.72。這些結果錶明成礦物質主要是與造山作用有關的深部來源，屬于熱液成因的充填型鉛鋅礦床。
호북경산향산사연자광상부존우진단계상통등영조화한무계하통하부장자구조，광석류형위탄산염암형화함탄혈암형량충。연자광체수북서향구조공제，양번-엄제심대단렬위도광구조，공제착성광류체적형성화운이，차급적북서향단렬급기파쇄대、렬극위용광구조。류체포과체연구현시，성광류체속우 NaCl-MgCl2-H2O체계，염도위9.47%~9.98 wt.%NaCleq.，온도위90~128℃，압력위（375.52~400.31）×105 Pa (최소포획압력)，대응적형성심도위1.25~1.33 km (최소포획심도)，표명기속우저온천성열액광상。광석류동위소조성δ34SCDT치변화개우-0.47역~10.16역지간，겁차위10.63역，평균치위6.99역。광석연동위소조성206Pb/204Pb치재17.842~17.976지간，평균17.923；207Pb/204Pb치재15.577~15.599지간，평균15.586；208Pb/204Pb치재37.786~37.867지간，평균37.834。μ치=9.47~9.51，평균치위9.49。Th/U치=3.69~3.78，평균치위3.72。저사결과표명성광물질주요시여조산작용유관적심부래원，속우열액성인적충전형연자광상。
The Xiangshansi Pb-Zn deposit, located in Jinshan County, Hubei Province, is hosted in the upper Sinian Dengying formation and the lower Cambrian Zhuanggouzi formation. The mineralization can be divided into two types, carbonate-type and carbon-bearing shale-type. Pb-Zn mineralization is controlled by the northwest-ward structures. The nearby Xiangfan-Guangji deep fault controls the formation and transportation of the ore-forming fluid and is a conducting structure. The subordinate northwestward faults and fractures are host structure. Results of fluid inclusion show that the ore-forming fluid belongs to NaCl-MgCl2-H2O system with the salinity between 9.47~9.98 wt%NaCleq and homogenized temperature 90~128℃, which indicates a minima trapping pressure and depth between (375.52 ~ 400.31) ×105 Pa and 1.25 ~ 1.33 km, respectively, and a low-temperature epithermal deposit. Theδ34SCDT composition of galena spans-0.47‰~10.16‰with a range of 10.63 ‰and an average of 6.99 ‰. The composition of lead isotopes 206Pb/204Pb ranges from 17.842 ~ 17.976 (average 17.923); 207Pb/204Pb 15.577~15.59 (average 15.586); 208Pb/204Pb 37.786~37.867 (average 37.834). Theμvalues are between 9.47 ~9.51, averaging 9.49 and Th/U 3.69 ~ 3.7, averaging 3.72. Those combined evi-dence indicate ore-forming materials are mainly from deep source associated with orogenesis, and Pb-Zn deposit is subjected to structurally controlled filling type.
