【摘要】：隨州北部正長(zhǎng)花崗巖體呈巖脈出露,年代學(xué)研究表明,正長(zhǎng)花崗巖中巖漿鋯石SHRIMP U-Pb加權(quán)平均年齡為648.8±1.9Ma(MSWD=0.86),屬新元古代。巖石地球化學(xué)成分顯示其屬于高鉀鈣堿性、準(zhǔn)鋁質(zhì)系列花崗巖。巖體高硅(SiO_2=70.67%～75.75%)、富堿(K_2O+Na_2O=7.28%～8.53%)、鐵鎂比(FeO~T/MgO=26.37～35.50)較高、鈣鎂含量較低(CaO=0.60%～1.53%,MgO=0.07%～0.12%);稀土元素配分曲線呈右傾斜型,顯示Eu負(fù)異常(δEu=0.33～0.56);1000Ga/Al值介于2.60～3.41,Zr+Nb+Ce+Y=552.48×10~(-6)～648.87×10~(-6);微量元素原始地幔標(biāo)準(zhǔn)化蛛網(wǎng)圖顯示,Rb、K和Th等大離子親石元素明顯富集,相對(duì)富集Zr、Hf、Nb、Ta等高場(chǎng)強(qiáng)元素,相對(duì)虧損Sr、P和Ti,以上特征表明隨州北部正長(zhǎng)花崗巖為A1型花崗巖。結(jié)合區(qū)域構(gòu)造演化,認(rèn)為隨州北部正長(zhǎng)花崗巖形成于板內(nèi)伸展的構(gòu)造環(huán)境,新元古代晚期,秦嶺-桐柏-大別地區(qū)構(gòu)造體制經(jīng)歷了重要的轉(zhuǎn)變,在南秦嶺東段由古秦嶺洋的俯沖導(dǎo)致的擠壓作用轉(zhuǎn)換為弧后拉伸減薄作用。在伸展體制下,巖漿上涌形成本區(qū)A1型正長(zhǎng)花崗巖。
[Abstract]:The syenite granites in the northern part of Suizhou are dike-exposed. Chronological studies show that the SHRIMP U-Pb weighted average age of magmatic zircons in syenite granites is 648.8 鹵1.9Ma (MSWD=0.86), which belongs to Neoproterozoic. The geochemical composition of the rocks indicates that they belong to the high potassium calc-alkaline, quasialuminous granite series. High silicon (SiO_2=70.67%~75.75%), alkali rich (K) 2O Na_2O=7.28%~8.53%, high Fe / mg ratio (FeO~T/MgO=26.37~35.50) and low Ca and mg content (CaO=0.60%~1.53%,) are found in rock mass. MgO=0.07%~0.12%); The distribution curves of rare earth elements are inclined to the right, showing a negative anomaly of Eu (未 EU = 0.33 脳 0.56), a 1000Ga/ Al value of 2.60 脳 3.41, a Zr Nb Ce of 552.48 脳 10 ~ (- 6) ~ 648.87 脳 10 ~ (- 6), and a negative anomaly of REE (未 EU = 0.33 脳 0.56). The trace element original mantle standardized cobweb map shows that the large ion lithophile elements, such as Rb,K and Th, are enriched obviously, and the high field strength elements such as Zr,Hf,Nb,Ta are relatively enriched, and the Sr,P and Ti, are relatively deficient. The above characteristics indicate that the syenite granite in the north of Suizhou is a type A _ 1 granite. Combined with the regional tectonic evolution, it is believed that the syenite granite in the northern part of Suizhou was formed in the tectonic environment of intraplate extension. In the late Neoproterozoic, the tectonic system of Qinling-Tongbai-Dabie region underwent an important transformation. In the eastern part of the South Qinling Mountains, the compression caused by the subduction of the Palaeo-Qinling Ocean is transformed into the post-arc stretching and thinning. Under the extensional system, magmatic upwelling formed a type A _ 1 syenite in this area.
【作者單位】： 中國(guó)地質(zhì)科學(xué)院礦產(chǎn)資源研究所國(guó)土資源部成礦作用與資源評(píng)價(jià)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(編號(hào)41402180) 國(guó)土資源部中國(guó)地質(zhì)調(diào)查局項(xiàng)目(編號(hào)12120113069000)資助成果
【分類號(hào)】：P588.12;P597.3

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 羅蘭;蔣少涌;趙葵東;高文亮;;江西彭山錫多金屬礦集區(qū)隱伏花崗巖鋯石SHRIMP U-Pb年代學(xué)研究[J];礦物學(xué)報(bào);2009年S1期

2 狄永軍;吳淦國(guó);張達(dá);宋彪;臧文拴;張忠義;李進(jìn)文;;銅陵地區(qū)小銅官山和沙灘腳巖體鋯石SHRIMP U-Pb年代學(xué)研究及其巖石學(xué)意義[J];地質(zhì)學(xué)報(bào);2005年06期

3 靳克,許文良,王清海,高山,劉曉春;蚌埠淮光“混合花崗閃長(zhǎng)巖”的形成時(shí)代及源區(qū):鋯石SHRIMP U-Pb地質(zhì)年代學(xué)證據(jù)[J];地球?qū)W報(bào);2003年04期

4 逄偉;孫景貴;門蘭靜;陳雷;陳冬;常艷;梁樹能;張朋;聶喜濤;;延邊東部五道溝巖群的單顆粒鋯石SHRIMP U-Pb年代學(xué)及其地質(zhì)意義[J];中國(guó)地質(zhì);2008年06期

5 王成;李明濤;馬彥云;;海原巖群鋯石SHRIMP U-Pb測(cè)年及時(shí)代歸屬討論[J];寧夏工程技術(shù);2014年01期

6 高山,umin Qiu,凌文黎,Neal J.McNaughton,David I.Groves;崆嶺高級(jí)變質(zhì)地體單顆粒鋯石SHRIMP U-Pb年代學(xué)研究──揚(yáng)子克拉通>3.2Ga陸殼物質(zhì)的發(fā)現(xiàn)[J];中國(guó)科學(xué)(D輯:地球科學(xué));2001年01期

7 王德貴;李麗群;李剛;;東天山大鹽池東花崗閃長(zhǎng)巖鋯石SHRIMP U-Pb測(cè)年[J];地質(zhì)通報(bào);2006年08期

8 張玉修;張開均;黎兵;汪洋;魏慶國(guó);唐顯春;;西藏改則南拉果錯(cuò)蛇綠巖中斜長(zhǎng)花崗巖鋯石SHRIMP U-Pb年代學(xué)及其成因研究[J];科學(xué)通報(bào);2007年01期

9 王世進(jìn);萬渝生;王偉;宋志勇;董春艷;王立法;楊恩秀;;魯西蒙山龜蒙頂、云蒙峰巖體的鋯石SHRIMP U-Pb測(cè)年及形成時(shí)代[J];山東國(guó)土資源;2010年05期

10 崔建堂;王炬川;邊小衛(wèi);羅乾周;朱海平;王滿倉;陳高潮;;西昆侖康西瓦北部冬巴克片麻狀英云閃長(zhǎng)巖鋯石SHRIMP U-Pb測(cè)年[J];地質(zhì)通報(bào);2007年06期

相關(guān)會(huì)議論文 前3條

1 簡(jiǎn)平;劉敦一;張旗;張福勤;石玉若;施光海;張履橋;陶華;;蛇綠巖及蛇綠巖中淺色巖的SHRIMP U-Pb測(cè)年:簡(jiǎn)要評(píng)述[A];同位素地質(zhì)新進(jìn)展：技術(shù)、方法、理論與應(yīng)用學(xué)術(shù)研討會(huì)論文（摘要）集[C];2003年

2 李華芹;陳富文;路遠(yuǎn)發(fā);楊紅梅;郭敬;梅玉萍;;東天山三岔口銅礦區(qū)礦化巖體SHRIMP U-Pb年代學(xué)及鍶同位素地球化學(xué)特征研究[A];同位素地質(zhì)新進(jìn)展：技術(shù)、方法、理論與應(yīng)用學(xué)術(shù)研討會(huì)論文（摘要）集[C];2003年

3 戴寶章;蔣少涌;姜耀輝;趙葵東;劉敦一;;湘南道縣虎子巖中生代玄武巖中下地殼包體的鋯石SHRIMP U-Pb年代學(xué)與原位Hf同位素研究——巖漿底侵與地殼演化[A];2006年全國(guó)巖石學(xué)與地球動(dòng)力學(xué)研討會(huì)論文摘要集[C];2006年

，

本文編號(hào)：2436301