共查询到20条相似文献,搜索用时 15 毫秒
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Asadullah Kazi 《Natural Hazards》2014,70(1):839-864
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M. Qasim Jan M. Hassan Agheem Amanullah Laghari Suhail Anjum 《Journal of the Geological Society of India》2017,89(1):91-98
Kharsar hill is one of many granitic plutons comprising the Nagar Parkar igneous complex. The eastern part of the hill is occupied by grey-pink granite (earlier) and the western part by pink granite (later). They are composed of perthite, quartz, and plagioclase, with minor opaque oxide, biotite, titanite, local amphibole, and secondary chlorite, epidote, leucoxene/titanite. The pink granite is characterized by the presence of mafic clots. Both the granitoids are intruded by microgranite/aplite, and porphyritic mafic and rhyolite dykes, locally in swarms. These are abundant in a NE trending 200 m wide zone cutting the entire granite hill. The dykes may extend over 1 km in length and >10 m in thickness, but most are < 100 m in length. The felsic dykes are of several generations; some are associated with the two varieties of granite, others are contemporaneous with the rhyolite and mafic dykes. The mafic dykes can be grouped into two types one of which contains hornblende and the other augite as the principal mafic mineral. Major element analyses suggest that the granitic rocks are metaluminous. The Kharsar granites, like the others in Nagar Parkar, may be an extension of the Malani igneous suite of Rajasthan. The occurrence of bimodal mafic-felsic dykes and petrographic variation in the mafic dykes are briefly discussed. 相似文献
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贵州省煤炭资源赋存规律 总被引:2,自引:0,他引:2
通过系统收集、整理贵州省50余年来的各项煤田地质勘查资料和科研成果,以聚煤规律和构造控煤作用为切入点,对贵州省煤炭资源赋存规律进行研究。结果表明:贵州含煤区主要位于扬子陆块南部被动边缘褶冲带上,赋煤单元划分为4个赋煤带9个煤田,共有5类15种控煤构造样式,控煤构造方向有近南北向、北东向、北西向和近东西向4组;本区主要含煤地层为上二叠统,沉积古地理自西向东由陆相逐渐向海相过渡,其中三角洲平原相聚煤最好,聚煤中心在西部盘县、水城一带,煤层以中灰分、中-高硫煤为主,煤的变质作用类型主要为深成变质作用和区域岩浆热变质作用。研究结果为贵州省煤炭资源潜力评价提供依据,对煤炭资源进一步勘查具有指导意义。 相似文献
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Brenda S. Pierce Artur Martirosyan Gourgen Malkhasian Samvel Harutunian Grigory Harutunian 《International Journal of Coal Geology》2001,45(4):307
The Antaramut–Kurtan–Dzoragukh (AKD) coal deposit is a previously unrecognized coal field in north-central Armenia. Coal has been known to exist in the general vicinity since the turn of the century, but coal was thought to be restricted to a small (1 km2) area only near the village of Antaramut. However, through detailed field work and exploratory drilling, this coal deposit has been expanded to at least 20 km2, and thus renamed the Antaramut–Kurtan–Dzoragukh coal field, for the three villages that the coal field encompasses. The entire coal-bearing horizon, a series of tuffaceous sandstones, siltstones, and claystones, is approximately 50 m thick. The AKD coal field contains two coal beds, each greater than 1 m thick, and numerous small rider beds, with a total resource of approximately 31,000,000 metric tonnes. The coals are late Eocene in age, high volatile bituminous in rank, relatively high in ash yield (approximately 40%, as-determined basis) and moderate in sulfur content (approximately 3%, as-determined basis). The two coal beds (No. 1 and No. 2), on a moist, mineral-matter-free basis, have high calorific values of 32.6 MJ/kg (7796 cal/g) and 36.0 MJ/kg (8599 cal/g), respectively. Coal is one of the few indigenous fossil fuel resources occurring in Armenia and thus, the AKD coal field could potentially provide fuel for heating and possibly energy generation in the Armenian energy budget. 相似文献
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Tahseenullah Khan Mamoru Murat M. Qasim Jan Hafiz Ur Rehman Muhammad Zafar Hiroaki Ozaw Anwar Qadir Saqib Mehmood 《《地质学报》英文版》2016,90(Z1):124-124
正The Nagar Parkar complex consists of Neoproterozoic igneous and metamorphic rocks dissected by episodic mafic and felsic dykes.The latter can be classified broadly into porphyritic felsic dykes and aplitic felsic dykes(minor) 相似文献
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江苏省煤炭资源及开发现状与思考 总被引:2,自引:0,他引:2
介绍了江苏省煤炭资源的基本概况,主要煤层的简要特征,煤的类型和质量。叙述了江苏省煤炭资源储量的特点,讨论了解决煤炭短缺问题的方法和建议。分析了煤炭资源的开发利用现状,总结了江苏煤炭企业占用资源和经营的基本情况。 相似文献
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Tahseenullah Khan Mamoru Murata M. Qasim Jan Hafiz Ur Rehman Muhammad Zafar Hiroaki Ozawa Anwar Qadir Saqib Mehmood 《Arabian Journal of Geosciences》2017,10(14):308
The Nagar Parkar Igneous Complex consists of Neoproterozoic igneous and metamorphic rocks dissected by mafic, felsic, and rhyolitic dykes. The latter can be classified broadly into porphyritic felsic dykes intruding gray and pink granites at Nagar Parkar and the surrounding areas, and the orthophyric felsic dykes intruding amphibolites, deformed pink granites, and the alkaline mafic dykes in the Dhedvero area, north of Nagar Parkar. The porphyritic felsic dykes are composed of perthites, quartz, and albitic plagioclase whereas the orthopheric felsic dykes contain K-feldspar (dominant), plagioclase, and minor quartz. Geochemically, the porphyritic and orthophyric felsic dykes are subalkaline and alkaline demonstrating post-orogenic A2- and OIB-A1-type characteristic on Nb–Y–Ce and Nb–Y–3Ga ternary plots, respectively. One orthophyric felsic dyke contains normative acmite and sodium metasilicate. This study suggests two distinct tectonic regimes for the origin of the felsic dykes of the area. The porphyritic felsic dykes show similarities with the ~800–700 Ma granites of the area, the rhyolite dykes of the Mount Abu, western Rajasthan in India, and the granites of the Seychelles microcontinent. The orthophyric felsic dykes show chemical resemblance with the Tavidar volcanic suite of western Rajasthan and the Silhouette and North islands of the Seychelles microcontinent. This study confirms spatial and temporal links among the Rodinian fragments exposed in the Nagar Parkar area of Pakistan, western Rajasthan of India, and the Seychelles microcontinent. 相似文献
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山东省聊城东部地热田内蕴藏着丰富的地热资源,地质构造条件、热储地质条件都比较有利,是开发地热资源的有利地段.通过对已有钻探资料的分析,结合近年来的勘查项目研究成果,笔者认为聊城东部地热田属于岩溶裂隙层状传导型地热田,区域地质构造主要为聊考断裂和茌平断裂,热储层主要为奥陶纪马家沟组灰岩地层,该区的地温梯度主要受构造控制,断裂导热是形成本区地热田的一个重要因素,地下热水矿化度较小,含有多种对人体有益的矿物、元素,并且根据开发现状提出了合理的开发利用与保护政策. 相似文献
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M. Qasim Jan Amanullah Laghari M. Asif Khan M. Hassan Agheem Tahseenullah Khan 《Arabian Journal of Geosciences》2018,11(2):25
The Nagar Parkar area contains three distinct groups of rocks, from oldest to youngest, (1) basement rocks ranging in composition from mafic to (quartz)diorite, tonalite, granite, and younger granodiorite, (2) granite plutons similar in general features to those of the Malani Igneous Suite of Rajasthan, and (3) abundant mafic, felsic and rhyolitic dykes. The basement rocks show strong brittle and local plastic deformation, and epidote amphibolite/upper greenschist facies metamorphic overprint. The chemistry of the basement rocks contrasts the commonly agreed within plate A-type character of the Neoproterozoic granites (group 2) that are emplaced into them. The basement rock association is calc-alkaline; the granodiorite displays the compositional characteristics of adakites, whereas the tonalite has intermediate composition between typical adakite and classical island arc rocks. This paper presents detailed petrography of the basement rocks and compares their geochemistry with those of the group 2 granites as well as with rocks from other tectonic environments. It is proposed that the Nagar Parkar basement is part of a 900–840 Ma magmatic arc that was deformed before it was intruded 800–700 Ma ago by the A-type continental granitic rocks followed by mafic to felsic dykes. 相似文献
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河南煤炭资源状况与形势 总被引:1,自引:0,他引:1
对河南省煤炭资源的开发,利用现状及尚未利用煤炭资源状况进行了综合评价,对煤炭资源的合理利用方向进行了评述,为河南省的煤炭工业规划规划和可持续发展战略的制定提供了依据。 相似文献
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通过对河南省煤层气地质条件及资源状况分析,对河南煤层气资源开发前景进行了符合实际的评价,指出了先期开发靶区,为今后煤层气勘探开发工作提供了依据。 相似文献
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以反映煤炭资源的勘查、利用状况为依据,将安徽省煤炭资源进行了分类统计;介绍了煤质总体特征及煤类;分析了煤炭资源勘查、利用现状;并提出了煤炭资源勘查建议。 相似文献
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运用层序地层原理,通过岩心和测井资料的综合分析,对新疆准东煤田西黑山勘查区西山窑组进行了层序地层研究,识别出3个体系域-)-低位、湖扩和高位体系域,并进一步进行了高频层序单元的划分。在层序地层格架的约束下,分析了西山窑组沉积体系的配置关系,识别出辫状河三角洲和湖泊沉积体系,进而细分为4个亚相和8个微相类型。同时,对煤岩样品进行了煤质分析和显微组分定量统计,确定了研究区煤相类型主要为潮湿森林沼泽相和干燥森林沼泽相。该区煤相的垂向演化规律受湖平面升降变化所控制,而湖平面的升降受层序地层格架的约束,在不同体系域中湖平面的变化控制泥炭沼泽的发育,从而决定了煤质煤相的演化规律。 相似文献