| 秦岭凤太矿田层控铅锌矿床的岩相古地理环境 |
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| 引用本文： | 杨锦源,张四喜.秦岭凤太矿田层控铅锌矿床的岩相古地理环境[J].沉积学报,1985,3(1):54-62. |
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| 作者姓名： | 杨锦源 张四喜 |
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| 作者单位： | 西北冶金地质勘探公司717队 宝鸡 |
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| 摘 要： | 凤太矿田,位于秦岭中段,陕西省凤县至太白一带。西接“西成矿田”;东邻“柞山矿田”。属秦岭泥盆系多金属、铁成矿带的一部分。本区铅锌矿产丰富,已经发现矿床、矿点数十处,其中大中型矿床四处。对于矿床成因,前人多认为属“中低温热液矿床”。随着工作的不断深入,发现凤太矿田内之铅锌矿体,主要赋存于中泥盆统古道岭组上岩段与星红铺组地层界面附近,严格受此地层层位控制;矿体形态多呈层状、似层状分布,沿走向和倾向均较稳定,矿体与围岩产状基本一致,多呈整合接触;矿石中矿物组份简单,主要金属矿物为闪锌矿、方铅矿;矿石中见有浸染状、胶状、条带状、细纹状等原生沉积作用所形成之构造残余;矿田内岩浆岩不发育,而且矿体空间分布和岩浆岩无明显的直接联系。因此，目前认为应属层控铅锌矿床。自一九七九年以来，在此认识的指导下，经过四年来的找矿实践，使原来四个中小型矿床发展成为四个大中型矿床，储量成倍增长，并在矿田内划分了七个矿化带，使找矿远景不断扩大。为了查明层控铅锌矿床形成规律，我们试图对主要含矿层位-一中泥盆统古道岭组上岩段沉积期的岩相古地理环境进行研究，以总结规律，继续扩大找矿效果。
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| 收稿时间： | 1983-06-01 |
TITHOFACIES AND PALEOGEOGRAPHY ENVIRONMENT OF STRATA-BOUND Pb Zn ORE DEPOSITS IN FENGXIAN-TAIBAI COUNTIES,SHAANXIPROVINCE |
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| Institution: | Metalo-geological Prospecting Company of Northwest China |
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| Abstract: | The ore field richin Pb zn ore deposits in the Fengxian-Taibai counties is located in the middle of the Qinling Mts.. The orebearing bed mainly exists in the transitional sedimentary beds between the Gudaoling Group and the xinghongpu Group of the Middle Devonian Series. It can be divided into two ore-bearing beds. The upper bed is the predominant one, forming the huge and the medium-sized ore deposits in this area. This paper briefly deals with the distribution of the sea and the land, the sea floor reliefs, the hydrodynamic conditions and the physico-chemical conditions during the sedimentary period of the main ore-bearing bed of the ore field in the Fengxian-Taibai counties. By the texture analysis section, it describes the evolutionary process of facies from the platform marginal shoal facies to the platform marginal bioherm facies-the localized platform facies-the platform marginal shoal facies-the platform marginal bioherm facies of the Middle Devonian (Lower Givetian) since the ore field is divided into two along the South-north line of Hetaoba, we have found a marked difference of the ore-forming characteristics between the east and the west of the ore field. The geographical distribution of some huge and medium-sized ore deposits clearly shows that the restricted environment forming the barrier island of the bioherms is favorable for the ore-formation. The field work has proved that the distribution of ore deposits is controlled by the barrier island of the bioherms in the neighboring region of the Weiziping. The ore-bearing bed was formed at the end of the two reef-building periods during the Middle Devonian (Lower Givetian), and the formation was closely related to the bioherms. Thus, the advantageous foundation was provided for the ore beds of later concentration under all kinds reconstruction process. In a word, the ore field in the Fengxian-Taibai Counties belongs to a kind of the strata-bound ore deposits, and some promising areas have been indicated in further prospectings. |
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