华南地质与矿产
華南地質與礦產
화남지질여광산
GEOLOGY AND MINERAL RESOURCES OF SOUTH CHINA
2011年
4期
342-351
,共10页
周开华%陆刚%陈春芳%田青%蒋亮%李新华%吴立河
週開華%陸剛%陳春芳%田青%蔣亮%李新華%吳立河
주개화%륙강%진춘방%전청%장량%리신화%오립하
地层划分对比%沉积岩咏%岩浆岩%区域地质构造%成矿规律及成矿预测%广西古美测区
地層劃分對比%沉積巖詠%巖漿巖%區域地質構造%成礦規律及成礦預測%廣西古美測區
지층화분대비%침적암영%암장암%구역지질구조%성광규률급성광예측%엄서고미측구
stratigraphic division and correlation%sedimentary dike%magmatic rock%regional tectonic%metallogenic regularity and metallogenic prognosis%Gumei area,Guangxi province
桂西地区古美测区1：5万区域地质调查，基本查明了测区地层格架、岩浆岩分布及时代、主要构造形迹特征、矿产分布规律以及盆地充填演化历史，主要取得了如下4个方面的进展：（1）查明测区晚古生代．中三叠世具有多阶段继承性发展演化的特征，完整的记录了华力西一印支期由裂至聚发展演化过程；查明早泥盆世晚期一中晚泥盆世存在台地前缘斜坡一盆地型、台地边缘型、远岸台地型、台地内部缓斜坡（或台洼）型四种类型的沉积；查明红泥坡地区寒武系的沉积特征，指出其应与桂北寒武系序列对比，发现其对测区晚古生代沉积分异具有重要的控制作用；通过对晚古生代地层中的大量多期次形成的沉积岩脉研究，获得了大量研究右江盆地演化和全球超大陆裂解的重要地层古生物学证据；在二叠纪环台地边缘发现的大量海绵藻礁滩建造丰富了中国南方二叠纪海绵藻礁的资料；首次发现了中上二叠统海绵礁灰岩与下三叠统罗楼组灰岩、中三叠统百逢组碎屑岩三者间的古岩溶超覆不整合接触关系；在下三叠统底部识别出一套广泛分布的与P／T界线发生的全球生物大灭绝事件之后的生物复苏、环境变迁密切相关的钙质微生物岩，将其作为非正式地层单位——“作登层”填图；对布兵第四纪盆地沉积进行了细致的调查，按成因从老至新划分为浔江组、白沙组、望高组、桂平组或临桂组。（2）采用“岩性＋时代”填图方法对测区岩浆岩的构造背景进行了调查研究，，新发现四个中细粒花岗岩、花岗斑岩小岩株、岩枝；首次发现花岗斑岩小岩枝与泥盆系郁江组泥质岩的“侵入状”接触关系。（3）对测区进行全面区域地质构造调查，基本查明了测区褶皱、断裂的分布、形状、产状及多期次构造活动与构造叠加特征，建立了构造格架，新发现浅层次大型滑脱构造及大规模的钙质糜棱岩一韧性剪切变形带，查明德保．坡洪大断裂及德保台地边缘的环形断裂具明显的控岩控相、控矿特征。（4）通过异常查证，发现金矿点两处，充分利用地、物、化、遥综合信息，研究测区内锰矿、铝土矿和金矿等矿产的分布规律，总结区域成矿条件、提出找矿方向，进行矿产资源远景评价和成矿预测。
桂西地區古美測區1：5萬區域地質調查，基本查明瞭測區地層格架、巖漿巖分佈及時代、主要構造形跡特徵、礦產分佈規律以及盆地充填縯化歷史，主要取得瞭如下4箇方麵的進展：（1）查明測區晚古生代．中三疊世具有多階段繼承性髮展縯化的特徵，完整的記錄瞭華力西一印支期由裂至聚髮展縯化過程；查明早泥盆世晚期一中晚泥盆世存在檯地前緣斜坡一盆地型、檯地邊緣型、遠岸檯地型、檯地內部緩斜坡（或檯窪）型四種類型的沉積；查明紅泥坡地區寒武繫的沉積特徵，指齣其應與桂北寒武繫序列對比，髮現其對測區晚古生代沉積分異具有重要的控製作用；通過對晚古生代地層中的大量多期次形成的沉積巖脈研究，穫得瞭大量研究右江盆地縯化和全毬超大陸裂解的重要地層古生物學證據；在二疊紀環檯地邊緣髮現的大量海綿藻礁灘建造豐富瞭中國南方二疊紀海綿藻礁的資料；首次髮現瞭中上二疊統海綿礁灰巖與下三疊統囉樓組灰巖、中三疊統百逢組碎屑巖三者間的古巖溶超覆不整閤接觸關繫；在下三疊統底部識彆齣一套廣汎分佈的與P／T界線髮生的全毬生物大滅絕事件之後的生物複囌、環境變遷密切相關的鈣質微生物巖，將其作為非正式地層單位——“作登層”填圖；對佈兵第四紀盆地沉積進行瞭細緻的調查，按成因從老至新劃分為潯江組、白沙組、望高組、桂平組或臨桂組。（2）採用“巖性＋時代”填圖方法對測區巖漿巖的構造揹景進行瞭調查研究，，新髮現四箇中細粒花崗巖、花崗斑巖小巖株、巖枝；首次髮現花崗斑巖小巖枝與泥盆繫鬱江組泥質巖的“侵入狀”接觸關繫。（3）對測區進行全麵區域地質構造調查，基本查明瞭測區褶皺、斷裂的分佈、形狀、產狀及多期次構造活動與構造疊加特徵，建立瞭構造格架，新髮現淺層次大型滑脫構造及大規模的鈣質糜稜巖一韌性剪切變形帶，查明德保．坡洪大斷裂及德保檯地邊緣的環形斷裂具明顯的控巖控相、控礦特徵。（4）通過異常查證，髮現金礦點兩處，充分利用地、物、化、遙綜閤信息，研究測區內錳礦、鋁土礦和金礦等礦產的分佈規律，總結區域成礦條件、提齣找礦方嚮，進行礦產資源遠景評價和成礦預測。
계서지구고미측구1：5만구역지질조사，기본사명료측구지층격가、암장암분포급시대、주요구조형적특정、광산분포규률이급분지충전연화역사，주요취득료여하4개방면적진전：（1）사명측구만고생대．중삼첩세구유다계단계승성발전연화적특정，완정적기록료화력서일인지기유렬지취발전연화과정；사명조니분세만기일중만니분세존재태지전연사파일분지형、태지변연형、원안태지형、태지내부완사파（혹태와）형사충류형적침적；사명홍니파지구한무계적침적특정，지출기응여계북한무계서렬대비，발현기대측구만고생대침적분이구유중요적공제작용；통과대만고생대지층중적대량다기차형성적침적암맥연구，획득료대량연구우강분지연화화전구초대륙렬해적중요지층고생물학증거；재이첩기배태지변연발현적대량해면조초탄건조봉부료중국남방이첩기해면조초적자료；수차발현료중상이첩통해면초회암여하삼첩통라루조회암、중삼첩통백봉조쇄설암삼자간적고암용초복불정합접촉관계；재하삼첩통저부식별출일투엄범분포적여P／T계선발생적전구생물대멸절사건지후적생물복소、배경변천밀절상관적개질미생물암，장기작위비정식지층단위——“작등층”전도；대포병제사기분지침적진행료세치적조사，안성인종로지신화분위심강조、백사조、망고조、계평조혹림계조。（2）채용“암성＋시대”전도방법대측구암장암적구조배경진행료조사연구，，신발현사개중세립화강암、화강반암소암주、암지；수차발현화강반암소암지여니분계욱강조니질암적“침입상”접촉관계。（3）대측구진행전면구역지질구조조사，기본사명료측구습추、단렬적분포、형상、산상급다기차구조활동여구조첩가특정，건립료구조격가，신발현천층차대형활탈구조급대규모적개질미릉암일인성전절변형대，사명덕보．파홍대단렬급덕보태지변연적배형단렬구명현적공암공상、공광특정。（4）통과이상사증，발현금광점량처，충분이용지、물、화、요종합신식，연구측구내맹광、려토광화금광등광산적분포규률，총결구역성광조건、제출조광방향，진행광산자원원경평개화성광예측。
Stratigraphic framework, temporal and spatial distribution of magmatic rocks, main tectonic framework, distributive law of mineral resources and filling history of basins of Gumei area, Guangxi province, are investigated in 1：50 000 regional geological survey. Multistage inheritance evolution of geological history Neopaleozoic Gumei area is illustrated, which records the complete process of Variscian-Indosinian evolution history. Four types of sedimentation： platform foreslope basin-, platform margin-, infralittoral platform- and intra-platform glacis- （or syneclise-） type, were developed in late of Early Devonian-middle of Late Devonian. Cambrian system in Hongnipo area which should be contrasted with the same strata sequence of northern Guangxi province, plays an important role in sediment differrntiation process of Neopaleozoic in Gumei area. Lots of sedimentary dikes in Neopaleozoic strata are providing a great deal of paleontologic and stratigraphic information for retrieving evolution history of Youjiang basin and global supercontinent cracking process. Lots of sponge reefs are found around Permian platform margin environment, and fossil karst uncon- formability of overlap among Mid-Upper Permian sponge reef-bearing limestone, limestone of Lower Triassic Luolou Formation and clastic rock of Middle Triassic Baifeng Formation are first discovered. Lower Triassic ＂Zuodeng Formation＂ which is composing of widely distributed calci-microbialite related to biotic recovery and environmental transition after end-Permian global mass extinction events, is a newly found informal strati- graphic unit. The sedimentary sequence of Bubing Quaternary basin can be subdivided into Xunjiang Formation, Baisha Formation, Wanggao Formation and Guiping Formation （or Lingui Formation）. Four middle-fine grained granite intrusions are newly found in magmatic rocks mapping by ＂lithology plus epoch＂ method, and the intrusion contact relationship between granite porphyry apophysis and argillaceous rock of Devonian Yu- jiang Formation. The spatial and temporal distribution characters, structural feature of folds and faults in survey area are investigated in detail. Shallow level large-size detachment structure and large-scale Calcareous mylonite-bearing ductile shear deformation zone are found in Gumei area. The important role of Debao-Hongpo major fracture and ring fractures around Debao platform for sedimentation, magma intrusion and mineral- ization process are investigated. Two gold ore occurrences are found by geochemical exploration methods. Metallogenic regularity and prognosis of mineral deposits are summarized by collecting geologic, geophysical, geochemical and remote sensing information in the surveyed area, which can guild future prospecting work.
