广西钦州那必锰矿地质特征及成因认识     

伍静  喻亨祥  刘耀辉 《矿产与地质》2007,21(3):326-328

研究认为,那必锰矿为次生淋滤及堆积型矿床,其产出特点为：矿体主要产于紫色含锰硅质岩段（D3l^3）中,并受破碎带及层间裂隙控制,似层状产出,沿倾斜方向,延伸一般不会超过35m.其富集规律为：铁、锰矿沉积关系密切,菱锰矿与褐铁矿共生,但在表生淋滤环境下两者往往分离,锰质淋移至深部,而铁质则富集于上部.因此,含锰褐铁矿矿体常产于锰矿体的上部,可成为锰矿找矿的一种地表直接标志.  相似文献   

低品位磷矿的生物选矿、化工冶金一体化研究     

肖文丁  肖太阳 《矿产与地质》2007,21(3):363-365

利用生物冶金的方法,将不溶性磷源转化为水溶性或枸溶性磷源,从而提供了一条利用低品位磷矿的新途径.讨论了生物和微生物在磷化工中的研究与应用,介绍了用自制菌磷肥在田间试验所取得的结果,提出了利用生物工程的方法处理低品位磷矿而直接生产磷肥的技术路线.  相似文献   

广东河台金矿田控矿构造研究   总被引：2，自引：0，他引：2  

欧阳玉飞  刘继顺  黄满湘  杨立功 《矿产与地质》2007,21(1):27-30

在查明河台金矿田地质特征的基础上,着重研究了控矿构造形式、构造演化特征,总结了构造控矿规律,并建立了河台金矿构造控矿模式。  相似文献   

糖蜜酒精废液中钾测定方法的研究     

孙伟  彭金云  陈斌强 《矿产与地质》2007,21(2):214-216

采用四苯硼钠溶液滴定电导-测量法,对糖蜜酒精废液中钾的测定方法进行了研究。该法简便快速,测定周期仅需20m in左右,所需试剂种类和用量少,准确度和精密度与四苯硼钾重量法相当。  相似文献   

Geochronological and geochemical constraints on the petrogenesis of Early Eocene metagabbroic rocks in Nabang (SW Yunnan) and its implications on the Neotethyan slab subduction     

《Gondwana Research》2015,28(4):1474-1486

Mafic rocks similar to those of the Gangdese belt have been poorly reported in the Nabang area (SW Yunnan Province in SW China) of the Eastern Himalayan Syntaxis. This led to a widely-accepted assumption that Early Eocene mafic rocks are absent in Nabang. This paper reports new zircon U–Pb, Lu–Hf isotopic, whole-rock elemental and Sr–Nd isotopic data for the recently identified Tongbiguan and Jinzhuzhai metagabbroic plutons. Our data show that the two mafic plutons crystallized at 53.2 ± 0.4 Ma and 53.6 ± 0.7 Ma, respectively, with zircon in-situ ε_Hf(t) values ranging from − 3.1 to + 4.9. Our data confirm the presence of Early Eocene mafic rocks in Nabang, contemporaneous with the major magmatic flare-ups of ~ 52 Ma in South Tibet. The rocks show high-K calc-alkaline basalt and basaltic andesite composition. They are characterized by subparallel spiky patterns with enrichment in LILEs, depletion in HFSEs and P–Ti negative anomalies. They show (Nb/La)n = 0.21–0.63, Ce/Pb = 2.99–9.91 and Nb/U = 5.2–14.1, along with high ⁸⁷Sr/⁸⁶Sr(t) ratios of 0.7061–0.7077 and ε_Nd(t) values of − 3.4 to − 5.6. Such geochemical signatures are similar to those of the synchronous Dangxung gabbroic and Yangbajing ultrapotassic rocks. Their least-contaminated samples can petrogenetically be attributed to input of slab-derived fluid into the lithospheric mantle. In conjunction with other available data, the mafic suite can be geochronologically and geochemically correlated to those in South Lhasa and are probably the equivalents of the Gangdese southeastward extension. Their formation might tectonically be related to slab rollback in response to the decreasing convergence rate. The termination of the Neotethyan subduction in SW Yunnan might be later than ~ 52 Ma, identical to that in South Tibet.  相似文献   

Timing of juvenile arc crust formation and evolution in the Sapat Complex (Kohistan–Pakistan)     

Pierre Bouilhol  Urs Schaltegger  Massimo Chiaradia  Maria Ovtcharova  Andreas Stracke  Jean-Pierre Burg  Hamid Dawood 《Chemical Geology》2011,280(3-4):243-256

The combination of age determination and geochemical tracers allows understanding the source evolution during magmatism. We studied the Sapat Complex, in the exhumed Cretaceous Kohistan Paleo-Island Arc, to reconstruct the formation of the juvenile lower arc crust and the evolution of the mantle source during arc magmatism. High precision ID-TIMS U/Pb dating on zircon, shows that a protracted period of magmatic accretion formed the Sapat Complex between 105 and 99 Ma. Since continued melt percolation processes that formed the lower crust obscured the original bulk rock Nd–Pb–Sr isotopic composition, we rely on the Hf isotopic composition of zircons of different ages to unravel the source evolution. Nd and Pb bulk isotopic compositions coupled with Hf isotopic composition on zircons allow reconstructing a geodynamical scenario for the Sapat Complex, and the Cretaceous history of the Arc. We suggest that trenchward migration of the hot mantle source at 105 Ma explains the small heterogeneous εHf signal between + 14 and + 16. This heterogeneity vanished within ca. 2 million years, and the εHf of the source evolved from + 16 to + 14 at 99 Ma. Integrated to the Kohistan Cretaceous history, which has a baseline of εHf ≈ 14, these data pinpoint two geodynamical events, with slab retreat and the formation of the Sapat Complex followed by splitting of the Kohistan island arc at 85 Ma.  相似文献   

氡气测量圈定油气藏边界     

姚锦其  赵友方  李大德  颜自给 《矿产与地质》2011,25(3):248-252

依据油田和油田水中的氡气含量比地壳和地表空气高5～6个数量级,氡气常沿油气田周边微细裂隙和油(气)水边界向上运移的特点,应用美国产RAD7型电子测氡仪先在四川盆地磨溪、麻柳场气田上进行了氧气测量,在气田周边发现的环带状氡气异常与钻探证实的气水边界基本吻合,而后在新疆准中盆地永进地区利用氡气测量法圈定的油(气)水边界和油...  相似文献   

西藏扎西康铅锌锑多金属矿地质特征及矿床成因探讨   总被引：2，自引：0，他引：2  

王晓曼  李及秋  张学良  赵延朋 《矿产与地质》2011,25(4):273-279

扎西康铅锌锑多金属矿已发现规模较大的四个矿体,控制资源量达100万吨以上.矿体均分布在NNW或NNE张扭性断裂破碎带内,受断裂破碎带控制,矿体与围岩界线明显.铅同位素位组成显示成矿物质主要来源于上地壳,包裹体研究成矿流体为中低温-低盐度成矿,氢、氧、硅同位素组成显示成矿流体主要为大气降水下渗循环构成的地热水.硫同位素特...  相似文献   

西藏拉屋铜锌矿床地质特征及找矿方向     

赵延朋  何国朝  王晓曼  张学良 《矿产与地质》2011,25(2):126-130

拉屋铜锌矿床位于冈底斯铜铅锌多金属成矿带东段,成矿地质条件非常有利.矿体赋存于NW向同沉积断裂(F3)及附近的矽卡岩地层中,呈层状、似层状、透镜体状,主要受矽卡岩层与喷流机构构造控制,为典型的喷流沉积后期热液叠加改造矿床.经系统的地、物、化勘查,控制了铜、锌(333以上)资源量达13.56万吨.文章总结了该矿区地质特征...  相似文献   

斜发沸石矿物材料处理生活污水实验研究     

徐文炘  李蘅  黄伟  雷金勇  张静  肖筱瑜 《矿产与地质》2011,(6):514-518

研究选用的斜发沸石矿物材料属单斜面晶系,颜色为白色、淡黄色,硬度为4左右,介电常数为7.0～7.5,比重为2.16.扫描电镜图表明,该斜发沸石呈宽板条状,细板条状、不规则粒状等,粒径在0.02～0.05mm,长宽比为4∶1.化学成分分析表明,w(SiO2)为69.12％,w(Al2O3)为11.27％,w(CaO)为7...  相似文献