Trace metals in tissues of gray whale (Eschrichtius robustus) carcasses from the Northern Pacific Mexican Coast

Samples of liver, lung, heart, muscle, and blubber tissue from the carcasses of juvenile gray whales (Eschrichtius robustus) found stranded on the coast off the Sea of Cortez, México were analyzed for a range of trace metals (Cu, Fe, Zn, Mn, Ni, Pb, and Cd). The highest concentrations of copper, iron, zinc, and manganese were found in liver; nickel and lead in heart, and cadmium in kidney. In all tissues analyzed, iron, zinc and copper were present in the highest concentrations; however, some whales also showed high levels of cadmium in the kidney which could be related to their diet. Elevated concentrations of copper were found only in the liver of one whale. In general, where low levels of iron were found in the liver, they were associated with poor nutrition. Lead, nickel, manganese and zinc levels in liver were within the normal range, indicating that these whales had not been exposed to high levels of these metals.     

TBT contamination identified in Antarctic marine sediments

We report for the first time butyltin contamination of near-shore sediments at six sites in the Ross Sea, Antarctica. A very high concentration of 2290 microg Sn kg(-1) sediment was recorded in one sample. The most likely source is abrasion of antifouling paint from the hulls of ice-breakers, but this pattern of contamination is also possible following ship groundings. Antifoulant biocides, such as TBT, have not been considered or detected in Antarctica previously and represent a new challenge to environmental managers and custodians.     

俄罗斯阿尔泰-Sayan地区Aksug斑岩Cu-Mo体系的地质与地球化学特征

The Aksug deposit, located in Altay-Sayan region of Russia, is one of the largest porphyry Cu-Mo deposits in Southern Siberia. The ore-bearing porphyries of the Aksug porphyry Cu-Mo system were formed in post-collisional environment. Geochemically they belong to calk-alkaline and high K-calk-alkaline series. Rocks are characterized by enrichment of LILE and depletion of HSFE and HREE, showing the importance of subduction-related components in magma generation. Large plutonic intrusions that host porphyry systems have been formed during collision. The origin of porphyritic rocks is dominantly the mantle with lower crustal contribution. The mainly economically important Cu-Mo mineralization is closely related to a porphyry series in time and space, being emplaced towards the end of magmatic activity. Though the emplacement of plutonic and ore-bearing porphyry complexes took place in different geodynamic environments, both complexes are characterized by certain similarity in geochemical composition, alkalinity, trace element content, Sr isotopic composition. This fact evidently indicates a common deep-seated magmatic source (at the lower crust-upper mantle level). Low initial ⁸⁷ Sr/⁸⁶ Sr, sulfur isotopic characteristics and presence of PGE-Co-Ni mineralization in associated pyrite-chalcopyrite ores suggest that mantle source of chalcophile elements was of high importance in porphyry Cu-Mo mineralization of the Aksug deposit.     

河北蔡家营铅-锌-银矿床矿物特征和金、银、铋赋存状态的研究

本矿床是燕山期的热液充填-交代脉状铅-锌-银矿床。其中伴生有综合利用伤值的金、银。金、银主要呈微粒自然金、银金矿、脆银矿、螺状硫银矿、深红银矿、黝锑银矿和自然银产出。金矿物常与辉铋铅矿、自然铋、未命名的Bi_2Te矿物相伴生,包裹于或充填于黄铁矿、铁闪锌矿、含铁闪锌矿和方铅矿的微裂隙中。银矿物通常产于方铅矿、铁闪锌矿和黄铁矿的解理或裂隙内,但不与金、铋矿物伴生。金、银矿化晚于铅、锌矿化,而金矿化相对早于银矿化。     

我国首次发现的砷钙锌石和羟砷锌石的矿物学特征及其意义

我国首次发现的砷钙锌石和羟砷锌石产于内蒙古自治区额济纳旗老硐沟金矿脉氧化带矿石的空洞中。砷钙锌石多呈半自形或自形晶体，绿或淡绿色，透明，比重４．３２（计算）。Ｎｇ＝１．７７８，Ｎｍ＝１．７６０，Ｎｐ＝１．７５６，二轴晶（＋），２Ｖ＝４６°。化学分子式为Ｃａ０．９９（Ｚｎ０．９４Ｃｕ０．０７）１．０１［（ＡｓＯ４）０．９７（ＣＯ３）０．０３］１．００（ＯＨ），其中（ＣＯ３）２－取代部分（ＡｓＯ４）３－为红外光谱分析所证实，这不同于国外报道的砷钙锌石。据Ｘ射线粉末衍射分析的主要谱线，计算得其晶胞参数：ａ＝０．７４７３ｎｍ，ｂ＝０．９０１７ｎｍ，ｃ＝０．５９１６ｎｍ。羟砷锌石常呈集合体或单个晶体产出，淡黄绿色或无色，透明，比重４．４４（计算）。Ｎｇ＝１．７６１，Ｎｍ＝１．７３８，Ｎｐ＝１．７１９，二轴晶（＋），２Ｖ＝８７°。化学分子式为（Ｚｎ１．９７Ｃａ０．０２）１．９９（ＡｓＯ４）（ＯＨ）。据Ｘ射线粉末衍射分析的主要谱线，计算得其晶胞参数：ａ＝０．８３０４ｎｍ，ｂ＝０．８５１６ｎｍ，ｃ＝０．６０５４ｎｍ。氧化矿石的主要矿物组合为：臭葱石＋褐铁矿＋针铁矿＋砷钙锌石＋羟砷锌石＋自然金＋自然银＋石英＋方解石＋蛋白