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Article: Geochemical characteristics and 40Ar- 39Ar ages of the amphibolites and gabbros in Tarlang area: Implications for tectonic evolution of the Chinese Altai

TitleGeochemical characteristics and 40Ar- 39Ar ages of the amphibolites and gabbros in Tarlang area: Implications for tectonic evolution of the Chinese Altai
阿爾泰塔爾浪地區斜長角閃巖和輝長巖的形成時代、地球化學特征和構造意義
Authors
Keywords斜長角閃巖 (Amphibolite)
輝長巖 (Gahbro)
~(40)Ar-~(39)Ar年齡 (40Ar- 39Ar Age)
俯沖消減 (Subduction)
阿爾泰 (Altai)
構造轉換 (Tectonic Transition)
古亞洲洋 (Paleo-Asian Ocean)
Issue Date2007
PublisherChinese Academy of Sciences, Institute of Geology and Geophysics. The Journal's web site is located at http://www.ysxb.ac.cn/ysxb/ch/index.aspx
Citation
Acta Petrologica Sinica, 2007, v. 23 n. 5, p. 877-888 How to Cite?
AbstractAmphibolitic and gabbroic rocks occur in Tarlang area in Chinese Altay. Amphibolites are metamorphosed products of mafic magmatic rocks (SiO 2 = 45.42% - 52.96%) and contain high Al 2O 3 (13.14% - 17.92%), Fe 2O 3 T (9.08% - 16.88%) and TiO 2 (0.82% - 3.23%) contents. The amphibolite samples show relatively flat REE patterns, without significant fractionations of REEs (La/Yb N = 1.53 - 1.79). These samples are depleted in HFSEs slightly, with slightly Ti-Nb-Ta negative anomalies, which suggest a subtle relation to subduction-related environment. The gabbroic samples (SiO 2 = 46.96% - 49.86%) have intermediate TiO 2 (0.38% - 1.89%) and relatively low K 2 O contents (K 2 O = 0.34% - 1.03%), belonging to subalkali rocks (Na 2 O > K 2 O). They have relatively high Al 2O 3 (15.0% - 20.81%), CaO (10.13% - 11.60%) and moderate MgO (7.3% - 8.3% ) contents. The gabbroic samples show two types of REE patterns. One is characterized by slight fractionation of REEs (La/Yb N = 1.10 - 1.67) and weak Eu anomalies (δEu = 1.03 - 1.10), while the other is enriched in LREE s (La/Yb N = 5.97 - 6.39), with significantly positive Eu anomalies (δEu = 1.31 - 1.44), which may reflect accumulation of plagioclase in the magma chamber. These gabbroic rocks all exhibit Ti-Nb-Ta troughs and Pb-Sr spikes, also implying a subduction-related origin. The 40Ar/ 39Ar spectrum of the gabbroic sample is simple and flat (plateau age of 266.9 ± 4.2Ma; isochron age of 261 ± 23Ma), indicating that its K-Ar isotopic system was not seriously disturbed by subsequent thermal events and may reflect the intrusion time of the gabbro. However, 40Ar- 39Ar analysis of the amphibolite give rise to a saddle-like spectrum, and its youngest plateau (297.3 ± 6.1Ma) probably reflects the last metamorphic event. The difference on age and geochemistry between the amphibolitic and gabbroic rocks implies that they probably represent different mafic magma. The protolith of amphibolites probably formed in a seamount near a subduction zone and subsequently accreated to the Altai. The gabbro exhibits subduction-releted characteristics and was coeval with transtensional movement in the Chinese Altai, probably reflecting a tectonic transition in the Permian.
阿爾泰塔爾浪地區出露一些斜長角閃巖和輝長巖。其中,斜長角閃巖為基性巖漿巖變質的產物,SiO_2含量為45.42%~52.96%,具有較高的Al_2O_3(13.14%~17.92%)、Fe_2O_3~T(9.08%~16.88%)和TiO_2(0.82%~3.23%)含量。斜長角閃巖樣品稀土元素曲線比較平坦,輕重稀土元素分餾不明顯(La/Yb_N=1.53~1.79),無明顯的Nb和Ta虧損。通過野外產狀及地球化學特征分析,認為該斜長角閃巖形成于海山的構造環境。輝長巖SiO_2(46.96%~49.86%)含量稍低,TiO_2(0.38%~1.89%)變化較大,并富Al_2O_3(15.0%~20.81%)、CaO(10.13%~11.60%),具有中等至較高MgO含量(7.3%~8.3%)和相對較低的鉀含量(K_2O=0.34%~1.03%),屬亞堿性巖石系列(Na_2O>K_2O)。輝長巖呈現兩種稀土元素組成特征。一種輕重稀土分餾不明顯,配分曲線比較平坦(La/Yb_N=1.10~1.67),具有輕微的Eu正異常(δEu=1.03~1.10);另一種輕重稀土元素分餾較明顯(La/Yb_N=5.97~...
Persistent Identifierhttp://hdl.handle.net/10722/151227
ISSN
2015 Impact Factor: 1.234
2015 SCImago Journal Rankings: 0.892
References

 

DC FieldValueLanguage
dc.contributor.authorCai, KDen_US
dc.contributor.authorYuan, Cen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorXiao, WJen_US
dc.contributor.authorChen, HLen_US
dc.contributor.authorLong, XPen_US
dc.contributor.authorZhao, YJen_US
dc.contributor.authorLi, JLen_US
dc.date.accessioned2012-06-26T06:19:01Z-
dc.date.available2012-06-26T06:19:01Z-
dc.date.issued2007en_US
dc.identifier.citationActa Petrologica Sinica, 2007, v. 23 n. 5, p. 877-888en_US
dc.identifier.issn1000-0569en_US
dc.identifier.urihttp://hdl.handle.net/10722/151227-
dc.description.abstractAmphibolitic and gabbroic rocks occur in Tarlang area in Chinese Altay. Amphibolites are metamorphosed products of mafic magmatic rocks (SiO 2 = 45.42% - 52.96%) and contain high Al 2O 3 (13.14% - 17.92%), Fe 2O 3 T (9.08% - 16.88%) and TiO 2 (0.82% - 3.23%) contents. The amphibolite samples show relatively flat REE patterns, without significant fractionations of REEs (La/Yb N = 1.53 - 1.79). These samples are depleted in HFSEs slightly, with slightly Ti-Nb-Ta negative anomalies, which suggest a subtle relation to subduction-related environment. The gabbroic samples (SiO 2 = 46.96% - 49.86%) have intermediate TiO 2 (0.38% - 1.89%) and relatively low K 2 O contents (K 2 O = 0.34% - 1.03%), belonging to subalkali rocks (Na 2 O > K 2 O). They have relatively high Al 2O 3 (15.0% - 20.81%), CaO (10.13% - 11.60%) and moderate MgO (7.3% - 8.3% ) contents. The gabbroic samples show two types of REE patterns. One is characterized by slight fractionation of REEs (La/Yb N = 1.10 - 1.67) and weak Eu anomalies (δEu = 1.03 - 1.10), while the other is enriched in LREE s (La/Yb N = 5.97 - 6.39), with significantly positive Eu anomalies (δEu = 1.31 - 1.44), which may reflect accumulation of plagioclase in the magma chamber. These gabbroic rocks all exhibit Ti-Nb-Ta troughs and Pb-Sr spikes, also implying a subduction-related origin. The 40Ar/ 39Ar spectrum of the gabbroic sample is simple and flat (plateau age of 266.9 ± 4.2Ma; isochron age of 261 ± 23Ma), indicating that its K-Ar isotopic system was not seriously disturbed by subsequent thermal events and may reflect the intrusion time of the gabbro. However, 40Ar- 39Ar analysis of the amphibolite give rise to a saddle-like spectrum, and its youngest plateau (297.3 ± 6.1Ma) probably reflects the last metamorphic event. The difference on age and geochemistry between the amphibolitic and gabbroic rocks implies that they probably represent different mafic magma. The protolith of amphibolites probably formed in a seamount near a subduction zone and subsequently accreated to the Altai. The gabbro exhibits subduction-releted characteristics and was coeval with transtensional movement in the Chinese Altai, probably reflecting a tectonic transition in the Permian.en_US
dc.description.abstract阿爾泰塔爾浪地區出露一些斜長角閃巖和輝長巖。其中,斜長角閃巖為基性巖漿巖變質的產物,SiO_2含量為45.42%~52.96%,具有較高的Al_2O_3(13.14%~17.92%)、Fe_2O_3~T(9.08%~16.88%)和TiO_2(0.82%~3.23%)含量。斜長角閃巖樣品稀土元素曲線比較平坦,輕重稀土元素分餾不明顯(La/Yb_N=1.53~1.79),無明顯的Nb和Ta虧損。通過野外產狀及地球化學特征分析,認為該斜長角閃巖形成于海山的構造環境。輝長巖SiO_2(46.96%~49.86%)含量稍低,TiO_2(0.38%~1.89%)變化較大,并富Al_2O_3(15.0%~20.81%)、CaO(10.13%~11.60%),具有中等至較高MgO含量(7.3%~8.3%)和相對較低的鉀含量(K_2O=0.34%~1.03%),屬亞堿性巖石系列(Na_2O>K_2O)。輝長巖呈現兩種稀土元素組成特征。一種輕重稀土分餾不明顯,配分曲線比較平坦(La/Yb_N=1.10~1.67),具有輕微的Eu正異常(δEu=1.03~1.10);另一種輕重稀土元素分餾較明顯(La/Yb_N=5.97~...-
dc.languagechien_US
dc.publisherChinese Academy of Sciences, Institute of Geology and Geophysics. The Journal's web site is located at http://www.ysxb.ac.cn/ysxb/ch/index.aspxen_US
dc.relation.ispartofActa Petrologica Sinicaen_US
dc.relation.ispartof岩石學報-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subject斜長角閃巖 (Amphibolite)en_US
dc.subject輝長巖 (Gahbro)en_US
dc.subject~(40)Ar-~(39)Ar年齡 (40Ar- 39Ar Age)en_US
dc.subject俯沖消減 (Subduction)en_US
dc.subject阿爾泰 (Altai)en_US
dc.subject構造轉換 (Tectonic Transition)en_US
dc.subject古亞洲洋 (Paleo-Asian Ocean)en_US
dc.titleGeochemical characteristics and 40Ar- 39Ar ages of the amphibolites and gabbros in Tarlang area: Implications for tectonic evolution of the Chinese Altaien_US
dc.title阿爾泰塔爾浪地區斜長角閃巖和輝長巖的形成時代、地球化學特征和構造意義-
dc.typeArticleen_US
dc.identifier.emailSun, M: minsun@hku.hken_US
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturepublished_or_final_version-
dc.identifier.scopuseid_2-s2.0-35948967508en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-35948967508&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume23en_US
dc.identifier.issue5en_US
dc.identifier.spage877en_US
dc.identifier.epage888en_US
dc.publisher.placeChinaen_US
dc.identifier.scopusauthoridCai, KD=14011943800en_US
dc.identifier.scopusauthoridYuan, C=35241599200en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridXiao, WJ=7202456615en_US
dc.identifier.scopusauthoridChen, HL=8620950800en_US
dc.identifier.scopusauthoridLong, XP=14012199100en_US
dc.identifier.scopusauthoridZhao, YJ=14013151400en_US
dc.identifier.scopusauthoridLi, JL=26643194200en_US

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