四川盐边稗子田志留系牙形刺生物地层的再研究

首次在稗子田剖面发现Caudicriodus woschmidti并确认Pterospathodus eopennatus带的存在;以前报道的本剖面的Ozarkodinacrispa和Ozarkodina eosteinhornensis经4次样品分析,仍得不到确认。稗子田剖面的普里道利统(Pridoli)的沉积可能不全,不宜建阶。志留系与泥盆系之间可能为假整合。进一步讨论了牙形刺分带以及志留系内部统间的界线。认为金淳泰等(2005)依据稗子田剖面命名的6个新阶名,不宜使用。     

Assessing the extent and sources of nitrate contamination in the aquifer system of southern Baldwin County,Alabama

A regional-scale groundwater study was conducted over a 2-year period to assess the extent of nitrate contamination and source identification for southern Baldwin County, AL. Groundwater wells were sampled and analyzed for nitrate and a host of other geochemical parameters which revealed that extensive areas within aquifer zone A2 exhibited nitrate concentrations exceeding regulatory limits. Spatial iso-concentration maps of nitrate were constructed using ArcGIS software to determine the extent and severity of contamination for the aquifers underlying southern Baldwin County with the primary interest focused on the heavily utilized aquifer zone A2. Nitrate levels in the central and northeastern portion of the study area were most extensive with maximum concentrations of 63 mg/L likely resulting from agricultural inputs. Several other small regions throughout the study area exhibited elevated levels of nitrate and chloride as high as 112 and 51.1 mg/L, respectively, and sources likely vary (i.e., residential septic systems, animal waste to agriculture). With the exception of a few groundwater samples, there was no obvious correlative relationship between chloride and nitrate concentration for data collected during the 2-year period. Collectively, a general inverse relationship between nitrate concentrations and well depth was observed for the aquifer system under investigation. The study provides an initial current data set of areas impacted or most vulnerable to nitrate contamination and initial assessment of likely sources of nitrate in the region.     

福建德化石头坂金异常区地质特征及找矿远景分析

德化县石头坂1：20000土壤金元素测量圈定以金为主多元素组合异常2个。异常分布于侏罗系上统长林组陆相火山碎屑沉积岩中,异常规模大,连续性好,长轴呈北西向平行排列,成矿地质条件好。     

福建浦城双坑铅锌银矿区地质地球化学特征及找矿方向

双坑矿区位于浦城管查-建阳溪东铜多金属找矿远景区内,水系沉积物和土壤金属量测量异常规模大,套合好、峰值高,具明显的浓集中心。区内分布有铅锌银丰度值高的大金山组变质岩和燕山早期黑云母花岗岩,断裂裂隙发育,成矿地质条件有利。通过区域地质条件、异常元素组合与分布特征分析,探讨矿区找矿方向。     

安溪潘田矿区地下水系统水文动态分析

潘田矿区处于较完整的水文地质单元（地下水系统）槽型盆地中,水文地质勘察通过对岩土层富水性、补给、径流、排泄条件等动态观测,基本查明矿区地下水系统,为矿区地下开采及地下水灾害防治提供依据。     

浅析激电法在建阳市井后钼矿区的找矿效果

建阳井后钼矿在新一轮矿产远景调查的矿点检查时开展了物探工作,发现激电异常,结合矿区成矿地质特征,推断其是隐伏钼矿（化）体引起的矿致异常,经工程验证得以证实。该区激电异常是深部找矿的有效标志。     

尤溪县蠕动滑坡地质灾害环境因素探讨

蠕动滑坡是尤溪县地质灾害主要类型之一,其分布的地形（地貌）环境为凹型坡,诱发动力来自降雨的季节性地表水和地下水的推动力,发生蠕动滑坡地段的基岩主要为晚侏罗世小涤序列中细粒石英闪长岩和细粒石英闪长岩,早侏罗世梨山组上段泥岩、粉砂质泥岩和晚侏罗世南园组的中酸性火山岩,地层倾向与坡向相同且倾角小于坡角,土体主要为含砂量少的塑性粘土。蠕动滑坡具有滑动速度缓慢,持续时间长,影响范围较大、治理困难等特点。     

浅析江西省龙南塔背风化壳型锆铪矿床地质特征

对龙南县塔背矿区锆铪矿床地质特征进行了归纳总结,为今后在赣南花岗岩区开展此类型找矿工作指出了找矿标志。     

广西靖西县三合铝土矿铝矿物特征及成因机制分析

以光薄片观察、X射线衍射分析及电子探针等先进方法为手段,对靖西县三合铝土矿的硬水铝石和三水铝石的矿物特征进行研究,并探讨其成因机制。研究认为该地区在表生条件下,含铝母岩经红土化风化作用形成三水铝石,三水铝石经变质作用脱水形成硬水铝石。     

耀县黄土记录的全新世东亚冬夏季风非同步演化

通过多指标分析了黄土高原中部地区耀县黄土剖面,重建了全新世以来该地区季风变化过程。结果显示研究区全新世冬、夏季风并非同步演化,夏季风： 10.0～9.4kaB.P.快速转强; 9.4～3.4kaB.P.为全新世强盛期,但夏季风在强盛期并不稳定,其中在 6.8～5.9kaB.P.存在一个衰退事件; 3.4kaB.P.以来夏季风快速衰退。在8.4kaB.P.之前,冬季风强盛,并逐渐减弱; 8.4～6.6kaB.P.冬季风较弱; 6.6～5.7kaB.P.存在一个冬季风突然增强; 5.7～1.7kaB.P.冬季风为全新世最弱的阶段; 1.7kaB.P.以来,冬季风强度迅速增大,具有不稳定性。耀县地区全新世冬、夏季风的演化过程不同步可能揭示了全新世冬、夏季风演化的主控因子不同。