| 西秦岭三叠系一个浊积岩序列金的地球化学特征 |
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| 引用本文：赖旭砻,谢树成,杜远生,章传玲,朱敬宾.1998.西秦岭三叠系一个浊积岩序列金的地球化学特征[J].地球学报,19(1):210-214. |
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| 基金项目:国家计委科技找矿项目,地矿部“九五”地质矿产资源与环境科技攻关项目 |
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| 中文摘要:本文在详细分析沉积韵律、沉积构造、成分及粒度的基础上，论证了四川省若尔盖县阿西乡牙相一带上三叠统卡车组一套浊积岩沉积。通过对牙相浊积岩序列的２３个采自各浊积旋回各层段的系列样品的金分析，发现这一浊积岩序列具有：以泥质粉砂岩、泥质岩为主的鲍玛序列的Ｄ—Ｅ段与其上旋回的以含砾砂岩、粗砂岩为特征的Ａ段含金量呈线性关系，表明这两段之间元Ａｕ元素发生了循环，进一步揭示了浊积岩具有金的可迁移性这一矿源层的重要特征。另外，砂质单元金含量比细粒的粉砂岩和泥岩要高，从浊积岩序列的底部旋回至上部回金的含量降低并由不稳定到稳定等规律。这预示了西秦岭三叠纪海盆中陆源金的重要性。 |
| 中文关键词:浊积岩 金地球化学特征 三叠系 西秦岭 |
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| Golden Geochemical Characteristics of a Triassic Turbidite Sequence in West Qinling |
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| Abstract:According to detailed analysis of sedimentary rhythm,structure,content and grain size,a typical Upper Triassic turbidite sequence is confirmed at Yaxiang,Zoige county,Sichuan provinece.23 successive gold analytical samples were collected from six Bouma cycles of this turbidite sequence.The golden content of the A member charactered by pebble_bearing sandstone and coarse sandstone shows linear relationship sith that of the underlying muddy siltstone and mudstone of the D—E member in these Bouma cycles.It means that the circulation of gold element between these two menbers has happened,and it further reveals the gold in the trubidite is migratable,which is an important character of source bed .At other hand,the golden content of the sandstone is higher than that of fine grain siltstone and mudstone,and tends to decrease and stabilize upward in the turbidite sequence.It implies that the continental source gold in the Triassic West Qinling basin may be very important. |
| keywords:turbidite gold geochemical characteristics Triassic West Qinling |
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