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

LIANG Hua ying; WANG Xiu zhang; CHENG Jing ping

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．

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

Key words:

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．

HTML

Reference (1)

[1]

1.Rona P A H-ydrothermal mineralization deposits in ocean crust 1978(02)

2.陈先沛;高计元;陈多福热水沉积作用的概念和几个岩石学标志 1992(03)

3.祁思敬;李英;曾章仁秦岭热水沉符号型铅锌(铜)矿床 1993

4.祁思敬;李英秦岭泥盆系铅锌成矿带 1993

5.韩发;R W哈钦林大厂锡多金属矿床热液喷气沉积的证据-含矿建造及热液沉积岩[期刊论文]-矿床地质 1989(02)

6.韩发;孙海田Sedex型矿床成矿系统[期刊论文]-地学前缘 1999(01)

7.Lijima A;HeinJR Siliceous deposits in Pacific region,Develop-ments in sedimentology 36 1983

8.Herzing P M Hydrothermal silica chimner field in Galapayos spreeding center at 86w 1988(01)

9.AdachiM;Yamamoto K;Suigisk R Hydrothermal chert and associat-ed siliceous rocks from the Northem Pacific:their geological significance as indication of ocean ridge a ctiving 1986(1-2)

10.周永章丹池盆地热水沉成因硅质岩地球化学特征 1990(03)

11.Bostroem K Genesis of ferromanganese deposits-diagnostic criteria from recent and old deposits1983

12.Fle Hydrothermal and hydrogeneous ferromanganes deposits 1983

13.Slack J F;Herriman N;Bames R Stratiform toumalinites in metamorphic teranes and their geological significance 1984(12)

14.Plimer IR Tourmalinites associated with Australia proterozoic subma-rine exhalative ores 1988

15.Taylor B E;Slack J F Tourraline from Appalachian-Caledonian mas-sive sulfide deposits: textural,chemical and isotopic relationships 1984

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

17.张奋生;彭少梅;伍广宇粤北新州地区乐昌峡群的层序和特征 1991(03)

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

21.朱大岗粤北大沟谷式金矿床地质特征及成因探讨 1994(03)

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

24.Klinkhammer G Rare earth elements in seawater near hy-drothermal vents 1983

25.Marchard A Rareearthelementsanduraniuminhigh-tempera-ture solutions from East pacific Rise hydrothermal vent field (13N) 1983

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)

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

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Proportional views

Related