粤北大沟谷热水沉积钠长石岩岩石化学及稀土元素

梁华英; 王秀璋; 程景平

ISSN 1000-0550 CN 62-1038/P

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粤北大沟谷热水沉积钠长石岩岩石化学及稀土元素

梁华英, 王秀璋, 程景平

文章导航 > 沉积学报 > 2001 > 19(3): 415-420

梁华英, 王秀璋, 程景平. 粤北大沟谷热水沉积钠长石岩岩石化学及稀土元素[J]. 沉积学报, 2001, 19(3): 415-420.

引用本文:

梁华英, 王秀璋, 程景平. 粤北大沟谷热水沉积钠长石岩岩石化学及稀土元素[J]. 沉积学报, 2001, 19(3): 415-420.

LIANG Hua ying, WANG Xiu zhang, CHENG Jing ping. Chemical Composition and REE Pattern of Hydrothermally Deposited Albitite in Northern Guangdong Province[J]. Acta Sedimentologica Sinica, 2001, 19(3): 415-420.

Citation:

LIANG Hua ying, WANG Xiu zhang, CHENG Jing ping. Chemical Composition and REE Pattern of Hydrothermally Deposited Albitite in Northern Guangdong Province[J]. Acta Sedimentologica Sinica, 2001, 19(3): 415-420.

梁华英, 王秀璋, 程景平. 粤北大沟谷热水沉积钠长石岩岩石化学及稀土元素[J]. 沉积学报, 2001, 19(3): 415-420.

引用本文:

梁华英, 王秀璋, 程景平. 粤北大沟谷热水沉积钠长石岩岩石化学及稀土元素[J]. 沉积学报, 2001, 19(3): 415-420.

Citation:

粤北大沟谷热水沉积钠长石岩岩石化学及稀土元素

中国科学院广州地球化学研究所,广州 510640

基金项目: 国家自然科学基金(批准号:49772114);中国科学院重点项目KZ952-91-435资助项目

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中图分类号: P595

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Chemical Composition and REE Pattern of Hydrothermally Deposited Albitite in Northern Guangdong Province

Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640

摘要

摘要: 大沟谷含金钠长石岩带上为层状下为脉状产于震旦系乐昌峡群片岩中,主要由钠长石岩及碳酸盐岩组成。钠长石岩多为块状及条带状构造。钠长石岩和片岩化学成分不同,钠长石岩相对富集Al₂ O₃ 、TiO₂ 、MnO、Na₂O、P₂O₅,而贫Fe₂O₃ 、FeO、MgO、CaO、K₂ O。在主要氧化物组成的直角坐标图上,钠长石岩和片岩位于不同的区域及具不同的变化趋势。钠长石岩稀土元素含量较低,在 12.5 6× 10 ^-6～ 5 5.6 6× 10 ^-6之间,具较低的La/Yb(1.82～ 6.42 )、La/Sm(0.96～ 2.99)、Gd/Yb(0.99～ 2.71)比值,较大的δEu异常范围 (0.41～ 0.8),弱的δCe异常。钠长石岩地质产状特征及稀土元素特征表明其主要是热水沉积形成的。
- 钠长石岩 /
- 稀土元素 /
- 热水沉积 /
- 粤北
Abstract: Dagougu gola-bearing albitite belt,composed of albitite and carbonate rock,occurred as stratiform in the upper part and filled veins in the lower part in the Lechangxia Group Schist,Sinian Period．The albitite usually with banded and massive structure is composed primary of albite(80％±),quartz(1％～15％±),carbonate rock(1％--5％±),rutile(1％±),apatite(1％±)and pyrite with minor tourmnaline and magnetite；the carbonate rock。occurred in the same occurrence as those of albitite,consists predominantly of dolomite(ankerite)(> 75％),calcite(>15％),albite(5％±)with the same minor minerals as those of albitite． Main element compositions of the albitite differ from that of the Lechangxia Group Schist,the former is rich in A1₂O₃。TiO₂,Mno,Na₂O。P₂O₅ and poor in Fe₂O₃,Feo,Mgo,Cao,K₂O．The albitite and adjacent I．Lechangxia Group Schist lie in different domains in the major oxides variation diagram including TiO₂-A1₂O₃, AL₂O₃一SiO₂,Mgo-Sio,TiO₂-SiO₂,Feo-Fe₂O₃,Mgo-Cao and reveal different variation tendency． The albitite has lower REE content,raring from l2．56×10^-6to 55．66*10^-6with lower La/Yb：1．82～6．42,La/Sm：0．96～2．99,Gd/Yb：O．99-2．71 ratios,negative Eu anomalies and weakly Ce anomalies．Chondrite-normalized patterns of REE in albitite differ from those of the Lechangxia Group Schist． Ccmbined field and geochemical data indicate that the Dagougu gold-bearing stratiform albitite do not represent the normal clastic sedimeents altered by sodium rich fluid．but owe its origin to hydrothermal sedimentation at or below the sediment-wlater interface in alkaline environment．
- albitite /
- REE /
- hydrothermal sedimentation Northern /
- Guangdong

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参考文献(1)

[1]

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16.Willner A P Torumalinites from the stratiform peraluminous mmta-morphic suit of the Central Namaqua Mobile Belt (South Africa) 1992

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18.彭少梅粤北大沟谷碎裂钠长石岩型金矿床的构造-热液成矿机理 1993

19.Slack J F Origin and significance of Tourmaline-rich rocks in the Bro-ken HiAll destrict,Australia 1993(03)

20.Qi Lia ng;HuJing;Gregoire D C Determination of trace elements ingranites by inductively coupledplasma mass spectrometry[外文期刊] 2000

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22.王中刚;于学元;赵振华稀土元素地球化学 1989

23.季克俭热液矿床的矿源水源及热源以及矿床分布规律 1992

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26.Eugster H P;Jones B F Gels composed of sodium-aluminum silicate,Lake Magadi, Kenya 1968

27.Coveney R M;Kelly W C Dawsonite as a daughter mineral in hy-drothermal fluid inclusions 1971(04)

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粤北大沟谷热水沉积钠长石岩岩石化学及稀土元素

中国科学院广州地球化学研究所,广州 510640

基金项目: 国家自然科学基金(批准号:49772114);中国科学院重点项目KZ952-91-435资助项目

收稿日期: 2000-05-24
修回日期: 2000-08-01
刊出日期: 2001-09-10

中图分类号: P595

关键词:

摘要: 大沟谷含金钠长石岩带上为层状下为脉状产于震旦系乐昌峡群片岩中,主要由钠长石岩及碳酸盐岩组成。钠长石岩多为块状及条带状构造。钠长石岩和片岩化学成分不同,钠长石岩相对富集Al₂ O₃ 、TiO₂ 、MnO、Na₂O、P₂O₅,而贫Fe₂O₃ 、FeO、MgO、CaO、K₂ O。在主要氧化物组成的直角坐标图上,钠长石岩和片岩位于不同的区域及具不同的变化趋势。钠长石岩稀土元素含量较低,在 12.5 6× 10 ^-6～ 5 5.6 6× 10 ^-6之间,具较低的La/Yb(1.82～ 6.42 )、La/Sm(0.96～ 2.99)、Gd/Yb(0.99～ 2.71)比值,较大的δEu异常范围 (0.41～ 0.8),弱的δCe异常。钠长石岩地质产状特征及稀土元素特征表明其主要是热水沉积形成的。

English Abstract

Chemical Composition and REE Pattern of Hydrothermally Deposited Albitite in Northern Guangdong Province

Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640

Received Date: 2000-05-24
Rev Recd Date: 2000-08-01
Publish Date: 2001-09-10

Keywords:

Abstract: Dagougu gola-bearing albitite belt,composed of albitite and carbonate rock,occurred as stratiform in the upper part and filled veins in the lower part in the Lechangxia Group Schist,Sinian Period．The albitite usually with banded and massive structure is composed primary of albite(80％±),quartz(1％～15％±),carbonate rock(1％--5％±),rutile(1％±),apatite(1％±)and pyrite with minor tourmnaline and magnetite；the carbonate rock。occurred in the same occurrence as those of albitite,consists predominantly of dolomite(ankerite)(> 75％),calcite(>15％),albite(5％±)with the same minor minerals as those of albitite． Main element compositions of the albitite differ from that of the Lechangxia Group Schist,the former is rich in A1₂O₃。TiO₂,Mno,Na₂O。P₂O₅ and poor in Fe₂O₃,Feo,Mgo,Cao,K₂O．The albitite and adjacent I．Lechangxia Group Schist lie in different domains in the major oxides variation diagram including TiO₂-A1₂O₃, AL₂O₃一SiO₂,Mgo-Sio,TiO₂-SiO₂,Feo-Fe₂O₃,Mgo-Cao and reveal different variation tendency． The albitite has lower REE content,raring from l2．56×10^-6to 55．66*10^-6with lower La/Yb：1．82～6．42,La/Sm：0．96～2．99,Gd/Yb：O．99-2．71 ratios,negative Eu anomalies and weakly Ce anomalies．Chondrite-normalized patterns of REE in albitite differ from those of the Lechangxia Group Schist． Ccmbined field and geochemical data indicate that the Dagougu gold-bearing stratiform albitite do not represent the normal clastic sedimeents altered by sodium rich fluid．but owe its origin to hydrothermal sedimentation at or below the sediment-wlater interface in alkaline environment．