贵州织金磷矿岩元素地球化学特征
ELEMENT GEOCHEMISTRY OF ZHIJIN PHOSPHORITES, GUIZHOU PROVINCE
查看参考文献33篇
|
文摘
|
采用电感耦合等离子体．质谱仪（ICP-MS）对贵州织金戈仲伍剖面戈仲伍组磷矿岩样品的微量、稀土元素含量进行了测定。戈仲伍组磷矿岩主要为生物碎屑白云岩、硅质磷块岩，普遍形成生物碎屑结构，以小壳类动物化石及藻类化石为主。分析结果表明，磷矿岩中As、Sb等微量元素富集，Co／Ni的比值为0．14，明显小于1；U／Th比值介于1．27-7．39之间。平均值为3．40；在lgw（U）．lgw（Th）关系图、Cr-Zr的关系图中样品点几乎都落在热水沉积区。表现出热水沉积成因的地球化学特征。磷矿岩中普遍富集稀土元素，含稀土总量∑REE较高。尤其富集Y重稀土元素；磷矿岩具Ce负异常，指示环境处于氧化程度相对较高状态；稀土元素北美页岩标准化模式曲线为帽状形态，指示在磷矿岩形成过程中有生物或有机质参与作用；磷矿岩普遍具Eu正异常、稀土总量较高、∑IREE／∑HREE比值较高的特征，暗示戈仲伍组磷矿岩具有正常海相沉积伴有海相热水沉积混合成因的特征。 |
|
其他语种文摘
|
Phesphorites from the Gezhongwu Formation in Zhijin County consist mainly of bioclast dolomitic and siliceous phesphorite. They generally show bioclast structure and are made mainly of small shelly fossils and alga fossils. The trace element and REE contents d phosphorites were analyzed by Finnigan Mat Element high resolution ICP-MS. The results of analysis suggest that the phosphorites are rich in As and Sb; the ratio of Co/Ni is 0.14 and the value is less than 1 ; the ratio of U/Th is between 1.27 and 7.39, the average is 3.40; the sample is located in the field of the hydrothermal sediments on the plots of lgw（U）-lgw（Th） and Cr-Zr, which indicates the phesphorites were deposited in hydrothermal environments. The phosphorites are rich in BEE, especially Y, the total REE concentrations are high. The Zhijin phesphorites show negative Ce anomalies, indicating that marine depesitional environments are oxic. PAAS-normalized REE concentrations plotted against respective atomic numbers are characterized by slight MREE enrichment, showing hat-shaped REE patterns. The patterns suggest that fauna played an important role in phesphorite formation. The phosphorites are characterized by positive Eu anomaly, high ∑REE and high ∑LREE/∑HREE ratio, suggesting that Zhijin phosphorites are of normal marine deposition plus hydrothennalism origin. |
|
来源
|
矿物学报
,2006,26(2):169-174 【核心库】
|
|
关键词
|
地球化学
;
磷矿岩
;
戈仲伍组
;
热水沉积
;
贵州织金
|
|
地址
|
1.
浙江林学院旅游与健康学院, 矿床地球化学国家重点实验室, 浙江, 杭州, 311300
2.
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1000-4734 |
|
学科
|
地质学 |
|
基金
|
中国科学院知识创新工程重要方向项目
;
浙江林学院科研发展基金
|
|
文献收藏号
|
CSCD:2510422
|
参考文献 共
33
共2页
|
|
1.
Wright J. Paleoredox variations in ancient oceans recorded by rare earth elements in fossil apatite.
Geochim Cosmochim Acta,1987,51:637-644
|
CSCD被引
164
次
|
|
|
|
|
2.
Grandjean P. The assessment of REEs patterns and143Nd/144Nd ratio in fish remains.
Earth Planetary Science Letter,1987,84:181-196
|
CSCD被引
24
次
|
|
|
|
|
3.
Bertram C J. 143Nd/144Nd and REEs in Silurian phosphatic fossils.
Earth Planetary Science Letter,1992,113:239-249
|
CSCD被引
15
次
|
|
|
|
|
4.
Ilyin A V. Rare-earth geochemistry of old'phosphorites and probability of syngenetic precipitation and accumulation of phosphate.
Chemical Geology,1998,144:243-256
|
CSCD被引
37
次
|
|
|
|
|
5.
Yang J D. Variations in Sr and C isotopes and Ce anomalies in successions from China:evidence for the oxygenation of Neoproterozoic seawater?.
Precambrian Research,1999,93:215-233
|
CSCD被引
75
次
|
|
|
|
|
6.
Mazumdar A. Rare-earth elements and stable isotope geochemistry of early Cambrian chert-phosphorite assemblages from the Lower tal Formation of the Krol Belt(lesser Himalaya India).
Chemical Geology,1999,156:275-297
|
CSCD被引
37
次
|
|
|
|
|
7.
Chen D F. Possible REE constrains on the depositional and diagenetic environment of Doushantuo Formation phosphorites containing the earliest metazoan fauna.
Chemical Geology,2003,201:102-118
|
CSCD被引
3
次
|
|
|
|
|
8.
Cook P J. Phosphorus phosphorite and skeletal evolution at the Precambrian-Cambrian boundary.
Nature,1984,308:231-236
|
CSCD被引
34
次
|
|
|
|
|
9.
张杰. 贵州织金新华含稀土磷矿床地球化学及生物成矿基本特征.
矿床地质,2002,21(增刊):930-934
|
CSCD被引
8
次
|
|
|
|
|
10.
王砚耕.
贵州上前寒武系及震旦系-寒武系界线,1984
|
CSCD被引
10
次
|
|
|
|
|
11.
张杰. 贵州织金新华含稀土磷矿床扫描电镜研究.
矿物岩石,2000,20(3):59-64
|
CSCD被引
20
次
|
|
|
|
|
12.
张杰. 贵州织金新华含稀土磷矿床稀土元素地球化学及生物成矿基本特征.
矿物岩石,2003,23(3):35-38
|
CSCD被引
25
次
|
|
|
|
|
13.
Qi L. Determination of trace elements in 26 Chinese geochemistry reference materials by inductively coupled plasma mass spectrometry.
Geostand Newsl,2000,24:51-63
|
CSCD被引
100
次
|
|
|
|
|
14.
黎彤. 地壳元素丰度的若干统计特征.
地质与勘探,1992,28(10):1-7
|
CSCD被引
71
次
|
|
|
|
|
15.
Marchig V. Some geochemistry indicators for discrimination between diagenetic and hydrothermal metalliferous sediments.
Marine Geology,1982,58(3):241-256
|
CSCD被引
127
次
|
|
|
|
|
16.
Bostrom K.
Hydrothermal Processes at Seafloors Spreading Centers,1983
|
CSCD被引
1
次
|
|
|
|
|
17.
潘家永. 滇西学拉铜矿区硅质岩特征及与成矿的关系.
中国科学(D辑),2001,31(1):10-16
|
CSCD被引
30
次
|
|
|
|
|
18.
Rona P A. Criteria for recognition of hydrothermal mineral deposits in ocean crust.
Economic Geology,1987,73(2):135-160
|
CSCD被引
21
次
|
|
|
|
|
19.
Wood D A. Are-appraisal of the use of trace elements to classify and discriminate between magma series erupted in different tectonic settings.
Earth Planet Sci Letts,1979,45:326-336
|
CSCD被引
141
次
|
|
|
|
|
20.
Quinby-Hunt M S. The provenance of low-calcic black shales.
Min Deposit,1991,26(2):113-121
|
CSCD被引
4
次
|
|
|
|
|
了解气象卫星更多信息，请访问