马塔比矿床位于印度尼西亚北苏门答腊省,是印度尼西亚近年确认的一处世界级高硫浅成低温热液型金-银矿床.文章在梳理前人研究的基础上,对其成矿地质特征与找矿标志进行了总结,以丰富该类型矿床实例,指导找矿实践.该矿床金银矿化呈现典型的高硫型浅成低温热液系统蚀变分带特征,由内而外依次发育硅化带、高级泥化带、泥化带、青磐岩化带.赋矿英安岩的锆石U-Pb定年结果为(3.8±0.5)Ma,热液变质成因明矾石的Ar-Ar坪年龄分别为(3.3±0.11)Ma和(2.14±0.10)Ma,表明成岩与成矿间隔时间较短,且可能存在两期高级泥化蚀变作用.成矿作用既有岩浆热液又有大气水的参与,后期地表风化作用使金和银进一步富集.马塔比矿床具有高硫型浅成低温热液矿床的典型特征,总结其找矿标志包括构造环境标志、岩性标志、蚀变标志和化探标志.

不同尺度地球化学填图能否获得稳定的和可追索的地球化学模式,能否真实反映元素含量背景,是检验填图方法是否可行的重要依据.笔者选择印度尼西亚苏门答腊岛巴东—明古鲁地区热带雨林区为研究对象,对比该区1:100万(1个样/100 km2)和1:25万(1个样/4 km2)两种不同比例尺的地球化学采样所获得的地球化学数据和异常分布模式,发现二者获得的元素含量背景值和中位数非常接近,所圈定的地球化学省在形态和变化趋势上非常类似,浓集中心的位置几乎完全重合,证明低密度地球化学填图也能获得稳定的和可追溯的地球化学模式,认为该方法在热带雨林区也是适用的.低密度地球化学填图圈出的地球化学省基本涵盖了研究区大的矿床和花岗岩体,真实的反映了研究区元素的分布情况,在这些地球化学省内开展更大比例尺的地球化学填图工作,能进一步圈定局部异常直接找矿,降低企业勘查投资风险.

The Dairi Pb-Zn ore concentration area, hosted by shale and displaying Sedex-type Pb-Zn mineralization of giant scale, is located in northwestern Sumatra, Indonesia.Systematic analysis of fluid inclusions and H, O, S and Pb isotopes was performed to probe its genesis.The results show that (1) the homogenization temperatures range from 189 to 315℃, with a peak at 220-240℃, indicating medium temperature for mineralization; (2)values of δ18OV-SMOW vary from +5.9‰ to +19.5‰, with an average of +16.6‰, implying a magma water-dominated mineralization fluid with minor addition of shallow water; (3)pyrites have positive δ34SCDT values from +25.49‰ to +26.36‰; (4)lead isotopes possess high μ values of 9.92-10.17(averaging 10.04) and ω values of 38.06-40.51 (averaging 39.26).It is indicated that the ores from Dairi formed at medium temperatures, having a fluid source dominated by magma water with minor addition of shallow water, a sulfur source comparable to ocean water and a single lead source from the crust.

Late Triassic A-type granites are identified in this study in Sarudik, SW Sumatra. We present new data on zircon U-Pb geochronology, whole-rock major and trace elements and Sr-Nd-Hf isotope geochemistry, aiming to study their petrogenesis and tectonic implications. LA-ICP-MS U-Pb dating of zircon separated from one biotite monzogranite sample yields a concordia age of 222.6 +/- 1.0 Ma, indicating a Late Triassic magmatic event. The studied granites are classified as weakly peralumious, high-K calc-alkaline granites. They exhibit high SiO2, K2O + Na2O, FeO/(FeO + MgO) and Ga/Al ratios and low Al2O3, CaO, MgO, P2O5 and TiO2 contents, with enrichment of Rb, Th and U and depletion of Ba, Sr, P and Eu, showing the features of A-type granites. The granites have zircon epsilon(Hf)(t) values from -4.6 to -0.4 and whole-rock epsilon(Nd)(t) values from -5.51 to -4.98, with Mesoproterozoic T-DM2 ages (1278-1544 Ma) for both Hf and Nd isotopes. Geochemical and isotopic data suggest that the source of these A-type granites is the Mesoproterozoic continental crust, without significant incorporation of mantle-derived component, and their formation is controlled by subsequent fractional crystallization. The Sarudik A-type granites are further assigned to A2-type formed in post-collisional environment. Combined with previous knowledge on the western SE Asia tectonic evolution, we conclude that the formation of the Late Triassic A-type granites is related to the post-collisional extension induced by the crustal thickening, gravitational collapse, and asthenosphere upwelling following the collision between the Sibumasu and the East Malaya Block.

应用"三步式"矿产资源定量评价方法,在对苏门答腊岛典型斑岩型铜(钼)矿床成矿特征进行分析基础上,构建该类铜(钼)矿床的描述性模型,认为该区斑岩型铜(钼)矿床与苏门答腊岛弧新生代中酸性次火山岩系关系密切,NW向苏门答腊断裂及其次级断裂起到控岩控矿的作用;结合该区已知铜(钼)矿床(点)分布及1:100万低密度地球化学测量成果,圈定了4处铜(钼)成矿远景区;根据密度模型公式估算出该区在90％、50％和10％预测概率下的矿床数;利用蒙特卡洛模拟方法预测该区斑岩型铜(钼)矿产在不同预测概率下的铜(钼)资源量,结果显示苏门答腊岛斑岩型铜(钼)矿产资源潜力巨大.

本文通过对广西环江县九逢锡矿锡石的赋存形式、碎裂特征、热液迁移及剪切变形相关性分析,认为该锡矿床中锡石矿物主要赋存于石英脉、蚀变砂岩及云英岩中.其中云英岩上、下盘石英脉中的锡石为主要赋存形式,且至少经历了自形结晶→矿物破碎→热液短距离迁移→快速冷凝结晶阶段.锡石主要以粗粒(>100μm)、细粒(10～100μm)和微细颗粒(＜10μm)三种状态存在.根据锡石内裂隙构造特征,认为碎裂锡石矿物的作用前期为左行剪切,以脆性碎裂为主,后期以韧性碎裂溶蚀为主,具有右行和左行特征,且携带锡石的热液在受到后期的韧性剪切有一定的改造作用.

对靖西地区出露的晚古生代基性-超基性岩进行了全岩主量、微量元素等地球化学研究,结果表明:基性岩主要为辉绿岩,超基性岩则为苦橄岩;基性岩具有较低的SiO 2 （51.34%～53.17%）和较高的MgO（4.67%～6.12%）含量,（K 2 O+Na 2 O）在5.03%～8.06%,具有典型碱性玄武岩特征;超基性岩则具有更低的SiO 2 （39.76%）和极高的MgO（23.97%）,二者均落入碱性玄武岩系列。基性-超基性岩∑REE在（45.47～128.95）×10 -6 ,（La/Yb） N 值在6.67～10.75,δEu值为0.96～1.08,稀土特征总体显示为轻稀土相对富集,重稀土相对亏损的右倾型式,具有与OIB相似的配分趋势,指示源区相对富集;基性-超基性岩不相容元素含量整体偏低,略亏损高场强元素（HREE、 Nb、 Ti等）,指示源区部分熔融程度较低。结合前人研究及岩石沉积背景特征,认为靖西基性-超基性岩为右江盆地早期演化的产物,形成于局部拉张的构造环境,与裂谷作用相关,推测该区域晚古生代受金沙江-哀牢山特提斯洋的打开和演化的影响,右江盆地局部拉张裂解,一系列深大断裂沿北西向展开,早期在局部形成与裂谷作用相关的岩浆活动。晚古生代后期右江盆地可能已演变为弧后盆地属性。

Late Triassic A-type granites are identified in this study in Sarudik, SW Sumatra. We present new data on zircon U–Pb geochronology, whole-rock major and trace elements and Sr-Nd-Hf isotope geochemistry, aiming to study their petrogenesis and tectonic implications. LA-ICP-MS U–Pb dating of zircon separated from one biotite monzogranite sample yields a concordia age of 222.6 ±1.0 Ma, indicating a Late Triassic magmatic event. The studied granites are classified as weakly peralumious, high-K calc-alkaline granites. They exhibit high SiO 2 , K 2 O + Na 2 O, FeO/(FeO + MgO) and Ga/Al ratios and low Al 2 O 3 , CaO, MgO, P 2 O 5 and TiO 2 contents, with enrichment of Rb, Th and U and depletion of Ba, Sr, P and Eu, showing the features of A-type granites. The granites have zircon ε Hf ( t ) values from −4.6 to −0.4 and whole-rock ε Nd ( t ) values from −5.51 to −4.98, with Mesoproterozoic T DM2 ages (1278–1544 Ma) for both Hf and Nd isotopes. Geochemical and isotopic data suggest that the source of these A-type granites is the Mesoproterozoic continental crust, without significant incorporation of mantle-derived component, and their formation is controlled by subsequent fractional crystallization. The Sarudik A-type granites are further assigned to A2-type formed in post-collisional environment. Combined with previous knowledge on the western SE Asia tectonic evolution, we conclude that the formation of the Late Triassic A-type granites is related to the post-collisional extension induced by the crustal thickening, gravitational collapse, and asthenosphere upwelling following the collision between the Sibumasu and the East Malaya Block.

通过对桂东南六陈中酸性侵入岩进行LA-ICP-MS锆石U-Pb定年、岩石学和地球化学研究,表明六陈中酸性侵入岩主要为二长花岗岩-钾长花岗岩组合,少量花岗闪长岩,岩石普遍含角闪石;岩石属富碱、高硅、高钾,属高钾钙碱性系列;稀土总量较高(∑REE 237.65×10-6～316.06×10-6),具中等铕亏损的轻稀土富集型的稀土配分曲线特征;对岩体进行了高精度的LA-ICP-MS锆石U-Pb定年,加权平均值为(245.1±1.2)Ma.该岩体总体显示为富碱性A2亚型花岗岩,形成于华南后碰撞伸展构造背景.

对凭祥辉绿岩岩石进行了全岩主量、微量元素地球化学及Sr-Nd同位素研究.结果表明,该辉绿岩属于碱性玄武岩系列,具有低SiO2(46.27％～47.39％)和高MgO(5.46％～7.18％)的特征;相对富集LREE亏损HREE,(La/Yb)N为4.37～9.45,δEu为0.98～1.08,无明显Eu异常;具有Sr的正异常,呈现出从E-MORB向OIB过渡的地球化学特征.辉绿岩的(87Sr/86Sr)i为0.705568～0.706617,εNd(t)为-0.65～+1.69,具有向富集地幔Ⅱ(EMⅡ)演化的趋势,揭示了其源区来自于轻微亏损的MORB型软流圈地幔至OIB型富集地幔的过渡源区.La/Sm-Sm/Yb判别图指示了基性岩来自石榴石二辉橄榄岩的部分熔融,结合Th/Yb-Ta/Yb判别图及区域地质背景,认为凭祥基性岩可能形成于古特提斯洋俯冲体系与峨眉山地幔柱相互作用引起的弧后拉张环境.

桂西地区龙川等地出露层状-似层状基性岩,对其岩石学及地球化学研究表明,该区辉绿岩属于碱性玄武岩系列,岩石SiO 2 含量为45.56%～46.76%, TiO 2 为2.83%～3.60%, Na 2 O+K 2 O为3.52%～4.28%,δ值为3.31～7.17;∑REE为（159.28～248.54）×10 -6 ,δEu=1.01～1.32。Ti/Y值为538～1 067,属于峨眉山高Ti玄武岩系列,与二叠纪ELIP内带高Ti玄武岩和桂西其他地区基性岩具有相似的地球化学特征。从Dy/Dy * -Dy/Yb和Ti/Y值协变关系中判别,龙川基性岩和峨眉山高Ti玄武岩具有同源性,与峨眉山高Ti玄武岩和桂西其他地区高Ti基性岩相比,表现出了更低Dy/Dy * 值特征,揭示了其熔体来源于更深部且熔融程度更低的岩浆源区,说明龙川极高Ti/Y基性岩代表了ELIP的地幔柱岩浆作用在外部带延伸的结果,是峨眉山地幔柱高Ti岩浆源区更低程度熔融的岩浆产物。

老挝沙耶武里B.Talan地区主要出露枕状、杏仁状玄武岩、中基性(含安山质)熔结火山角砾岩(含集块岩).采用LA-(MC)-ICP-MS锆石U-Pb同位素定年技术,获得了该玄武岩的结晶年龄为260.8±4.7 Ma(MSWD=0.0055),其形成时代为中二叠世晚期.该区玄武岩具低SiO2(45.82％ ～47.77％)和富钠贫钾(Na2 O/K2 O>1)特征;富集大离子亲石元素(Rb、Ba、U、K和Th),明显亏损Nb、Ta、P、Ti等高场强元素;稀土总量 ΣREE为(41.94～63.97)×10-6,δEu=0.96～1.08,具弱的正、负铕异常,总体上表现出LREE富集的右倾型配分模式;Nb/Ta值为3.89～11.56(平均7.25).岩石地球化学证据表明,B.Talan地区玄武岩的形成构造背景为岛弧环境;岩浆源区来自于岛弧下的俯冲板片熔融体,其成因与交代的地幔楔相关.

Syringoporoid tabulate corals are one of the most common benthic sessile organisms in the upper Famennian Etoucun Formation at the Huilong section, Guilin, South China. A multivariate morphometric analysis based on five morphological characters was applied to 29 coralla from three intervals in the formation. Cluster analysis, principal coordinate analysis, non-metric multidimensional scaling, and an examination of the qualitative morphological characteristics revealed the presence of four morphospecies representing Chia hunanensis Jia, 1977, Tetraporinus virgatus Tchudinova, 1986, Fuchungopora multispinosa Lin, 1963, and a new species designated as F. huilongensis. Interval A belongs to foraminifer biozones DFZ4 to DFZ6 and contains abundant C. hunanensis and scattered coralla of T. virgatus, whereas intervals B and C which are within foraminifer biozone DFZ7 contain abundant F. multispinosa, sporadic F. huilongensis, and rare fragmented corallites of C. hunanensis. The coralla are commonly tilted or overturned, which is especially obvious in intervals B and C, indicating that most of them settled on a soft substrate and were subjected to periodic high-energy events. The species of Fuchungopora display flexible growth strategies characterised by the fusion of their corallites. The high diversity of syringoporids recorded from South China indicates an obvious radiation of the tabulate corals in the uppermost Famennian. Syringoporids accounted for the majority of tabulate corals recorded in South China in the upper Famennian and represented a relatively high level of palaeobiodiversity before the Hangenberg Crisis.

Geochemistry study of platinum group element(PGE) was carried out on the Napo basic rock in western Guangxi,and compared with the basalt in ELIP to reveal the genesis and evolution of the basic rock. The PGE contents of the Napo high-Ti mafic rock and low-Ti mafic rock are quite different,high-Ti mafic rock is relatively rich in PGE(respectively,Ir (0. 063 - 0. 079) × 10 - 9,Ru (0. 047 - 0. 054) × 10 - 9,Rh (0. 153 - 0. 173) × 10 - 9,Pt(4. 183 - 4. 343) × 10 - 9,Pd(2. 7 - 2. 91) × 10 - 9) whereas low-Ti mafic rock is extremely poor in PGE(respectively,Ir(0. 005 - 0. 014) × 10 - 9,Ru(0. 008 - 0. 013) × 10 - 9,Rh(0. 003 - 0. 013) × 10 - 9,Pt(0. 064 - 0. 364) × 10 - 9,Pd(0. 055 - 0. 281) × 10 - 9) . The results show that the primitive mantle normalized PGE patterns of Napo high-Ti mafic rock are similar to ELIP,and basalts with low Cu /Pd and high Pt /Y ratios when compared to Napo low-Ti mafic rock. However,Napo low-Ti mafic rock displays a different primitive mantle normalized PGE patterns and lower PGE abundance and Pt /Y ratios,importantly with extremely high Cu /Pd ratios when compared to Napo high-Ti mafic rock and ELIP basalts. These features suggest that Napo high-Ti mafic rock inherited the feature of the Emeishan mantle plume source,but distinctive PGE characteristics of the Napo low-Ti mafic rock indicate that they may be co-affected by Paleo-Tethys subduction system and Emeishan mantle plume and formed by interaction between Emeishan mantle plume and Paleo-Tethys asthenosphere mantle.

本文通过对老挝沙耶武里地区纳克汗(B.Nakhan)剪切带进行岩石学、构造样式、动力学及运动学分析,认为该剪切带应变型式以K＜1的挤压型应变为主,表明其形成于挤压环境.带内构造岩的矿物组合以绿片岩相为主,变形温度为250℃～300℃,为一条具多期活动的低温绿片岩相具右旋逆冲型韧性剪切带.同时,在区域上纳克汗(B.Nakhan)剪切带与已发现的金矿带分布位置关系密切,空间上属于韧脆性区—脆性区域,这为下一步研究沙耶武里地区韧性剪切带与金矿的关系研究提供了一个新的重点方向.

那介石英斑岩体位于百色市右江区龙川镇境内,是华南右江褶皱带出露为数不多的花岗质岩石,目前对其地质、地球化学特征及成因缺乏充分认识.通过1∶5万区调工作,对桂西龙川地区那介岩体进行地质特征、岩石学、矿物学调研,并开展岩石地球化学测试,结果显示那介石英斑岩总体具富硅铝,贫钙镁、钛铁之特征,属于强过铝质“S”型花岗岩.稀土元素表现为轻稀土(LREE)富集,重稀土(HREE)亏损之特征.微量元素体现出Rb、U、Ta、P、Hf等富集,Ba、La、Nd、Ce、Zr、Ti亏损,具明显Rb、Ta、P峰及因分离结晶作用形成的Ba、Nd、Ti谷,为“S”型花岗岩.岩体形成于后碰撞造山环境,为地壳物质重熔的产物,与燕山期发生的华南大规模岩石圈伸展有关.

In order to meet the higher demands of mining automation systems for multi-function integrated in one of the leakage protection system performance,this article designed a Dual-core leakage protection systems based on single-chip Atmega128 and DSP TSM320C6678. Experiments show that this device are stable and reliable, and solved problem such as variable resistor of action, long time lag of action and mistrip. This power distribution device provides value of the certain theory basis and reference for mine design and manufacture and improve mine safety factor.

“广西1：25万凭祥、南宁、谅山（1/3幅）、北海（半幅）区调”项目测区地理位于广西西南部，南临北部湾、西南与越南接壤，构造上属华夏古陆与南华活动带的交切部位，处于古华夏构造域和环太平洋构造域的交汇处，是了解广西乃至整个华南区域地质的一个重要窗口，也是重要的成矿区带。上世纪60年代以来，广西区域地质测量队、中国科学院南京地质古生物研究所、中国科学院地质与地球物理研究所等单位先后开展了各种区域地质调查、矿产地质勘查、物化探测量、遥感、水文地质调查与地质科研工作等，并取得了丰硕的地质成果，但仍有一些重要问题尚待解决，如：前人认为上二叠统彭久组与下伏地层为角度不整合接触，但证据尚不充分；上志留统与下泥盆统是否为连续沉积尚需作进一步工作；对部分火山岩的时代归属依据不足；对测区构造变形历史、构造变形序次关系以及构造单元划分有待重新厘定等。

Based on geological survey of the Early Indosinian granites in southern Guangxi, two types of granites are recognized in the southwestern segment of the Qinfang tectonic belt, namely, metamorphic minerals-bearing granite and not metamorphic minerals-bearing granite. The petrological, geochemical and Sr-Nd isotope data reveal that these granites chemically belong to high K calc-alkaline series, and are characterized by enrichment in large ion lithophile elements (LILEs, e. g., Rb, Th, U, K and Pb) and relative depletion in high field strength elements (HFSEs, e. g., Nb, Ta, P and Ti). They have high values of (87Sr/86Sr)i=0.71525-0.71632 and low values of εNd(t)=-10.80--9.92. Such signatures display geochemical characteristics of typical subduction-related arc magmatic rocks. Zircon SHRIMP U-Pb dating shows that the 206Pb/238U weighted average ages of zircons from hypersthene-bearing granitic porphyry and biotite monzogranite are (248.8±1.9) Ma (MSWD=1.5) and (246.0±3.4) Ma (MSWD=2.2), respectively. Together with the Early Paleozoic MORB-type metabasic volcanic rocks and Permian E-MORB type basalts formed in a back-arc spreading center setting in the region, we conclude that a Paleozoic oceanic basin could occur within the southwestern segment of the joint belt between the Yangtze and Cathaysian blocks (so-called Qinzhou-Hangzhou joint belt), and that the Early Indosinian granites in the region were most likely generated in the setting associated with northward subduction of the oceanic plate between the Yangtze and Cathaysian blocks, where the mantle-derived magma caused the remelting of the ancient crust within subducted slab, and the melts was subjected to modification of the mantle-derived magma in different proportions.

The Napo‐Qinzhou Tectonic Belt (NQTB) lies at the junction of the Yangtze, Cathaysia and Indochina (North Vietnam) Blocks, which is composed of five major lithotectonic subunits: the Qinzhou‐Fangcheng Suture Zone (QFSZ), the Shiwandashan Basin (SB), the Pingxiang‐Nanning Suture Zone (PNSZ), the Damingshan Block (DB) and the Babu‐Lingma Suture Zone (BLSZ). On the basis of geochemical compositions, the Permian mafic igneous rocks can be divided into three distinct groups: (1) mafic igneous rocks (Group 1) from the Longjing region in the PNSZ and Hurun region in the BLSZ, which are characterized by intermediate Ti, P and Zr with low Ni and Cr contents; (2) mafic igneous rocks (Group 2) from the Naxiao and Chongzuo region in the DB, characterized by low‐intermediate Ti, P and Zr with high Ni and Cr concentrations; and (3) mafic igneous rocks (Group 3) from the Siming region in the Jingxi carbonate platform of the northwestern margin of the NQTB, with intermediate‐high Ti, P and Zr and low Ni and Cr contents. The Group 1 rocks yield a weighted mean 206 Pb/ 238 U age of 250.5±2.8 Ma and are geochemically similar to basalts occurring in back‐arc basin settings. The Group 2 rocks exhibit geochemical features to those basalts in island arcs, whereas the Group 3 rocks show geochemical similarity to that of ocean island basalts. All three groups are characterized by relatively low ε Nd ( t ) values (–2.61 to +1.10) and high initial 87 Sr/ 86 Sr isotopic ratios (0.705309–0.707434), indicating that they were derived from a subduction‐modified lithospheric mantle and experienced assimilation, fractional crystallization, and crustal contamination or mixing during magmatic evolution. Accordingly, we propose the existence of an arc‐back arc basin system that developed along the NQTB at the border of SW Guangxi Province (SW China) and northern Vietnam, and it was formed by continued northwestward subduction of the Cathaysian (or Yunkai) Block under the Yangtze Block, and northeastward subduction of the Indochina Block beneath the Yangtze Block during Permian time.