|Table of Contents|

Mineralogical Characteristics and Petrological Significance of the Tataleng Rapakivi Granite in the Northern Margin of Qaidam Basin (PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2008年第04期
Page:
337-345
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Mineralogical Characteristics and Petrological Significance of the Tataleng Rapakivi Granite in the Northern Margin of Qaidam Basin
Author(s):
HU Neng-gao1; WANG Rui2; WANG Xiao-xia3; SUN Yan-gui4; LIN Wei1; SHEN Wen-huan5
1.School o f Earth Sciences and Resource, Changan University, Xian 710054, Shaanxi, China; 2.Northwest Mining and Geological Exploration Bureau for Non ferrous Metals, 712 Team, Xianyang 712000, Shaanxi, China; 3.Development and Research Center o f China Geologic Survey Bureau, Beijing 100073, China; 4.The Geologic Survey Department o f Qinghai Province, Xining 810012, Qinghai, China; 5.The Chemical Geological Survey Academy o f Shandong Province, Jinan 250013, Shandong, China)
Keywords:
northern margin of Qaidam basin;  Tataleng intrusions;  rapakivi granite;  A-type granite;  biotite;  K- feldspar
PACS:
P588.1
DOI:
-
Abstract:
Petrographic observations and analyses for dominant minerals indicate that the Tataleng rapakivi granite experienced several stages of crystallization. The earliest stage is the crystallization of plagioclase biotite and quartz. The second stage is the main crystallization stage of the rounded K-feldspar phenocrysts. At the third stage, the crystallization of medium-to coarse-grained matrix minerals is accompanied by the growth of zoned rim of rounded phenocryst. The fine-grained matrix minerals, which distributed in the interstices of the coarser matrix minerals, are the results of the last stage. Biotite at different stages are always rich in iron, and the w(TFeO)/ w(TFeO+ MgO)ratios increase from 0.80 to 0.96 from the earliest stage to the last stage. Exsolved albite lamellas widely distributed in K-feldspars, and the calculated average compositions for rounded phenocrysts, medium-to coarse-grained and fine-grained K-feldspars are Or69. 61Ab29. 59An0. 80, Or71. 50Ab27. 94An0. 56 and Or72. 63Ab26. 47An0. 90, respectively. The An values of plagioclase included in the rounded phenocrysts, medium- to coarse-grained matrix and fine-grained matrix are 25. 98 to 29. 41, 23. 85 to 27. 48 and 11. 94, respectively. The characteristics of dominant minerals are identical with classic rapakivi granite, while the variations in mineral compositions testified an efficient process of crystallization differentiation.

References:

[1] 卢欣祥 , 孙延贵 , 张雪亭 , 等 .柴达木 盆地北缘 塔塔楞 环斑花 岗岩的 SHRIM P 年龄[J] .地质学报 , 2007 , 81(5):626-634 .
[2] 胡能高 , 王晓霞 , 孙延贵 , 等 .柴达木 盆地北缘 塔塔楞 环斑花 岗岩的岩相学和地球化学特征[J] .地质通报 , 2008 , 27(11): 1923-1932 .
[3] Whi tn ey J A , S tormer J C .The Di st ribut ion of NaAlSi 3O8 Betw een Coexi ting Mi crocline and Plagioclas e and Its Eff ect on Geotherm om et ric Cal culati ons [J] .Am erican Mineral ogi st , 1977 , 62 :687-691 .
[4] 张儒瑗 , 从柏林 .矿物 温度计和 矿物压 力计[M] .北 京 :地质 出版社 , 1983 .
[5] 胡能高 , 王晓霞 , 孙延贵 , 等 .柴北缘 鹰峰环斑 花岗岩 矿物学 特征及其岩石学意义[J] .矿物学报 , 2007 , 27(2):195-204 .
[6] 郁建华 , 傅会芹 , 张凤兰 , 等 .华北地 台北部非 造山环 斑花岗 岩及有关岩石[M] .北京 :中国科学出版社 , 1996 .
[7] Rieder M , H aapala I , Povond ra P .Mineralogy of Dark Mica f rom the Wiborg Rapakivi G ranit e Bath oli th s , Southeas tern Finland[J] .European Jou rnal of Mineralogy , 1996 , 8 :593- 605 .
[8] 王晓霞 , 卢欣祥 .秦岭沙河 湾环斑花 岗岩中黑 云母的研 究及 意义[J] .矿物岩石 , 1998 , 17(4):352-358 .
[9] R.m. O T , H aapala I.One H undred Years of Rapakivi Granit e[J] .Mineralogy and Pet rology , 1995 , 52 :129-146 .
[10] 胡 能高 , 申文环 , 王 晓霞 , 等 .柴达 木盆地北缘鹰峰 环斑花岗 岩的岩相学特征及相关 问题的讨 论[J] .地球科 学与环 境学 报 , 2006 , 28(4):1-9 .
[11] 王晓霞 , 王 涛 , 卢欣祥 , 等 .北秦岭老君山 、秦岭 梁环斑结构 花岗岩岩浆 混 合的 岩 相学 证 据及 其 意 义[J] .地 质通 报 , 2002 , 21(8/ 9):523-529 .
[12] Vorma A.Alkali Feldspars of the Wib org Rapakivi M as sif in Sou theast ern Finland [J] .Bu lletin de la Commi ssion Géologique de Fin lan de, 1971 , 246 :8-72 .
[13] Vorma A .On the Pet rochemis t ry of Rapakivi Grani tes w ith Special Referen ce t o the Laiti la Massif[J] .Geologi cal Su rvey of Finl and , 1976 , 285 :6-53 .
[14] Sim onen A , Vorm a A .Am phibole an d Biot it e f rom Rapakivi Grani te[J] .Bul let in de la Commis son Gol ogigue de Finland , 1969 , 238 :5-28 .
[15] 胡 能高 , 王晓霞 , 孙 延贵 , 等 .柴北 缘元古宙鹰峰环 斑花岗岩 及其共生岩石 的地 球化 学特 征及地 质意 义[J] .地质 论评 , 2007 , 53(4):460-472 .
[16] 王晓霞 , 卢欣祥 .北秦岭 沙河湾环 斑结构花 岗岩的矿 物学特 征及其岩石学意义[J] .矿物学报 , 2003 , 23(1):57-62 .

Memo

Memo:
-
Last Update: 2008-12-20