黑龙江苏家铁多金属矿床地质、地球化学特征及成因     

李海洋  杨言辰  叶松青  闫文强  蔡继宏  张国宾  王林 《世界地质》2012,31(4):656-664

苏家铁多金属矿床位于黑龙江省张广才岭成矿带内,受一撮毛碱长花岗岩体及相关花岗斑岩岩体控制。矿体产出于花岗斑岩和大理岩的接触带及层间破裂带内,主要为矽卡岩型铁锌矿体。组成矿体的主要矿石矿物为磁铁矿和闪锌矿; 围岩蚀变类型主要有矽卡岩化、矽化、角岩化、碳酸盐化和绿泥石化,其中矽卡岩化与矿化关系密切,是区内的主要找矿标志。矿床地球化学特征研究表明成矿物质来自壳源岩浆演化和上部热液交代碳酸岩地层,并在矽卡岩带内形成矿化体和矿体。结合成矿地质背景,确定苏家铁多金属矿床为矽卡岩型矿床。  相似文献   

新疆且末县旗那铁矿成矿地质特征及找矿前景     

廖黎明  程铂林 《四川地质学报》2012,(4):397-399

旗那铁矿是阿尔金山地区一种重要的铁矿类型。通过对该矿区所处成矿地质背景、矿床特征及矿床成因等进行分析,认为区内成矿地质条件较好,加强综合找矿,可望实现新的突破。  相似文献   

地面高精度磁法在建平大黑山铁矿区中的应用     

孙荣厚  张园  李万荣 《化工矿产地质》2012,(3):178-182

通过在建平大黑山铁矿区的地面高精度磁测,获取了磁异常数据,圈定了磁异常范围。随之对磁测数据进行化极处理和延拓等磁法数据处理,之后对磁异常进行了地球物理解释,大致查明了隐伏矿(化)体的分布和空间特征。结合当地的地质资料,对查找有利成矿异常带进行验证,达到寻找隐伏铁矿的目的,说明磁法勘探在此处寻找隐伏铁矿取得了较好的地质效果。  相似文献   

山东张宝庄铁矿水文地质特征研究     

邢业江  聂佩孝 《山东地质》2012,(4):30-32

张宝庄铁矿矿床位于当地侵蚀基准面以下,呈似层状,倾角多在45°以上,埋深20～888m。对矿区3个主要含水层及其之间的水力联系进行分析,这3个含水层分别为第四纪全新世冲洪积孔隙水含水层、基岩风化裂隙水含水层和泰山岩群变质岩构造裂隙水含水层,各含水层之间水力联系较弱。另外还研究了矿床充水因素、预测矿床正常涌水量和最大涌水量,在此基础上划分该矿区水文地质条件为中等类型。  相似文献   

青海省格尔木市哈西亚图地区铁多金属矿床的发现及意义     

黎存林  代岩  王雪萍  赵双喜 《西北地质》2012,45(1):222-228

通过钻探工程验证高精度磁测异常,2010年青海省核工业地质局发现了格尔木市哈西亚图地区矽卡岩型铁多金属矿,初步估算铁资源量规模已达中型。赋矿地层为古元古界金水口岩群下岩组,华力西期灰色石英闪长岩与成矿密切相关。这一突破性发现对环柴达木盆地古元古界金水口岩群分布区的铁多金属矿找矿具有重要指导意义。  相似文献   

扎日根铁矿区地质特征及找矿潜力分析     

陈学明  李春奎  窦全成  曲建明  铁樱 《西北地质》2012,45(1):249-256

扎日根铁矿区地处三江成矿带沱沱河段。位于巴颜喀拉晚印支褶皱造山带、羌塘陆块二大构造单元间之羌塘陆块一侧。矿区为一轴向近东西、形态不完整的背斜,出露地层为下二叠统开心岭群诺日巴尕日保组。赋矿围岩为印支期中-基性次火山岩体,东矿段赋矿岩体位于背斜核部及南翼,中、西矿段赋矿岩体位于背斜北翼。矿体主要受次火山岩体及其内部早期构造裂隙控制,矿床成因为次火山岩浆期后热液型。赋矿岩体所处构造部位有利于形成规模较大的磁铁矿床。本区用磁法寻找磁铁矿的效果较好,而目前矿区部分1∶2000磁异常没有深部工程验证或验证不足,钻探工程控制深度不够,应进一步加大对已有异常的验证力度,以扩大资源远景。矿区南部正磁异常尚未圈闭,扩大高精度磁测范围以便发现新的异常,再对异常进行反演确定磁性体分布范围及空间形态,锁定赋矿有利部位并进行钻探验证,有望在深部发现较大规模的磁铁矿体。  相似文献   

Origin of the Neoproterozoic Baijianshan Banded Iron Formation at the Southeastern Margin of the Tarim Block in NW China: Implication for an Extremely Reducing Ocean     

HAO Xiaoshu  ZHANG Chuanlin  ZHANG Huichao  DING Teng  YE Xiantao 《《地质学报》英文版》2022,96(1):208-220

The Neoproterozoic banded iron formations(BIFs)were closely associated with the“Snowball Earth”during the breakup of the Rodinia,thus they played an important role in our understanding of the atmospheric and oceanic oxygen levels during this period.In this contribution,the Neoproterozoic(ca.737 Ma)Baijianshan BIF at Southeast Tarim,northwestern China was identified.Magnetite is the dominated iron-species,which occurs as the lamina interbedded with chert.The BIF contains low concentrations of trace elements,and is depleted in light rare earth elements(LREEs)based on comparison with the Post-Archean Australian Shale(PAAS).In addition,the BIF exhibits slightly positive La-Eu anomalies,negligible Ce anomalies,insignificant Y anomalies,chondritic Y/Ho ratios(23-32),and slightly chondritic initial ε_Nd(t=737 Ma)values(?0.45 to 1.46,averaging 0.37).All these features indicate that the precipitation of Baijianshan BIF was closely related to the submarine low-T hydrothermal fluids with little detrital contribution.Moreover,the Baijianshan BIF is characterized by the significant enrichment of heavy Fe isotopes,with δ⁵⁷Fe_IRMM-014 values ranging from 1.78‰ to 3.05‰,revealing the partial oxidation of Fe²⁺ into Fe³⁺ during the precipitation of this BIF.Our data suggest that the formation of Baijianshan BIF was closely associated with a significantly reducing ocean,which most likely was isolated from the oxidized atmosphere by a local ice sheet.This Neoproterozoic Baijianshan ocean has the initial oxygen levels as low as,or even lower than that of Archean and Paleoproterozoic oceans.  相似文献   

曹妃甸浅滩表层砂体插桩深度研究   总被引：1，自引：1，他引：0  

陶常飞  吴建政  亓发庆  张子鹏 《海岸工程》2008,27(4):54-59

曾妃甸浅滩原为古滦河三角洲，三角洲废弃后，海底表层沉积物在波浪潮流的簸选及自重应力作用下，沉积物颗粒粗化，粒度单一，且堆积紧密，工程强度较高。平台在该海医插桩时往往难以贯穿该层，其实际插桩深度较预定深度存在较大偏差。本文对此类砂体的形成机制、插桩过程中土体的压实作用对砂体强度的影响进行了分析，在对砂体力学参数做出适当调整后，运用太沙基地基极限荷载公式进行计算，得到了与实际情况较为一致的结果。  相似文献   

Sulfide intrusion in the tropical seagrasses Thalassia testudinum and Syringodium filiforme     

Marianne Holmer  Ole Pedersen  Dorte Krause-Jensen  Birgit Olesen  Malene Hedegrd Petersen  Stephanie Schopmeyer  Marguerite Koch  Bente Aa. Lomstein  Henning S. Jensen 《Estuarine, Coastal and Shelf Science》2009,85(2):319-326

Sulfur and oxygen dynamics in the seagrasses Thalassia testudinum and Syringodium filiforme and their sediments were studied in the US Virgin Islands (USVI) in order to explore sulfide intrusion into tropical seagrasses. Four study sites were selected based on the iron concentration in sediments and on proximity to anthropogenic nutrient sources. Meadow characteristics (shoot density, above- and below-ground biomass, nutrient content) were sampled along with sediment biogeochemistry. Sulfide intrusion was high in T. testudinum, as up to 96% of total sulfur in the plant was derived from sediment-derived sulfides. The sulfide intrusion was negatively correlated to the turnover of sulfides in the sediments regulated by both plant parameters and sediment sulfur pools. Sediment iron content played an indirect role by affecting sulfide turnover rates. Leaf production was negatively correlated with sulfide intrusion suggesting that active growth reduced sulfide intrusion. Sulfide intrusion was lower in S. filiforme (up to 44%) compared to T. testudinum consistent with a higher internal nighttime oxygen concentrations found for S. filiforme. When S. filiforme can take advantage of its ability to maintain high internal oxygen concentrations, as was the case on the USVI, it could increase its success in colonizing unvegetated disturbed sediments with potentially high sulfide concentrations.  相似文献   

济宁市翟村铁矿小体重值与磁性铁品位的回归分析          下载免费PDF全文

边荣春  韩玉珍  王仕昌  王洪军 《山东国土资源》2014,30(5)

利用济宁市翟村铁矿勘查过程中取得的体重测试值与磁性铁品位数据进行了回归分析,得出回归方程为y=2.74+0.026x,经显著性、精度检验并结合实际实践,证明该一元回归方程具有显著性,预测精度较高。可以用该方程预测翟村铁矿区小体重值。  相似文献