Metamorphic P–T–t evolution of mafic HP granulites in the northeastern segment of the Tarim Craton (Dunhuang block): Evidence for early Paleozoic continental subduction
The Dunhuang block, which constitutes the northeastern segment of the Tarim Craton, is located between the Central Asian Orogenic Belt (CAOB) to the north and the Altyn–Qilian Orogenic Belt to the south. The present study reveals that the early Paleozoic HP mafic granulites from the Dunhuang block u...
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| Veröffentlicht in: | Lithos 2014-05, Vol.196-197, p.1-13 |
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| creator | He, Zhenyu Zhang, Zeming Zong, Keqing Xiang, Hua Klemd, R. |
| description | The Dunhuang block, which constitutes the northeastern segment of the Tarim Craton, is located between the Central Asian Orogenic Belt (CAOB) to the north and the Altyn–Qilian Orogenic Belt to the south. The present study reveals that the early Paleozoic HP mafic granulites from the Dunhuang block underwent four stages of metamorphism: prograde amphibolite-facies (M1), peak high-pressure (HP) granulite-facies (M2) and two late stages of amphibolite-facies retrograde metamorphism. Based on phase equilibrium modeling, P–T conditions of the four stages of metamorphism are estimated at 720–750°C and 11–13kbar, 760–800°C and 14–16kbar, 690–720°C and 8–8.5kbar, and at |
| doi_str_mv | 10.1016/j.lithos.2014.02.020 |
| format | Article |
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•The Dunhuang HP granulite underwent the four stages of metamorphism.•The HP granulite has a clockwise metamorphic P–T–t path.•The HP granulite has a peak-metamorphic age of 431Ma and a retrograde age of 403Ma.•The HP granulite formed by the early Paleozoic collisional orogeny.•The Beishan orogenic collage underwent multiple early Paleozoic collisional processes.</description><identifier>ISSN: 0024-4937</identifier><identifier>EISSN: 1872-6143</identifier><identifier>DOI: 10.1016/j.lithos.2014.02.020</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Beishan orogenic collage ; CAOB ; Dunhuang block ; Early Paleozoic ; HP granulite ; P–T–t path</subject><ispartof>Lithos, 2014-05, Vol.196-197, p.1-13</ispartof><rights>2014 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a362t-5907bb8b761c8045b43ea5037a286d4e4f2ec4d774c5764563d38c03be26ca8f3</citedby><cites>FETCH-LOGICAL-a362t-5907bb8b761c8045b43ea5037a286d4e4f2ec4d774c5764563d38c03be26ca8f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.lithos.2014.02.020$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>He, Zhenyu</creatorcontrib><creatorcontrib>Zhang, Zeming</creatorcontrib><creatorcontrib>Zong, Keqing</creatorcontrib><creatorcontrib>Xiang, Hua</creatorcontrib><creatorcontrib>Klemd, R.</creatorcontrib><title>Metamorphic P–T–t evolution of mafic HP granulites in the northeastern segment of the Tarim Craton (Dunhuang block): Evidence for early Paleozoic continental subduction</title><title>Lithos</title><description>The Dunhuang block, which constitutes the northeastern segment of the Tarim Craton, is located between the Central Asian Orogenic Belt (CAOB) to the north and the Altyn–Qilian Orogenic Belt to the south. The present study reveals that the early Paleozoic HP mafic granulites from the Dunhuang block underwent four stages of metamorphism: prograde amphibolite-facies (M1), peak high-pressure (HP) granulite-facies (M2) and two late stages of amphibolite-facies retrograde metamorphism. Based on phase equilibrium modeling, P–T conditions of the four stages of metamorphism are estimated at 720–750°C and 11–13kbar, 760–800°C and 14–16kbar, 690–720°C and 8–8.5kbar, and at <6kbar and <640°C respectively. Peak granulite-facies metamorphism is characterized by a low geothermal gradient of ca. 16°C/km. Zircon U–Pb dating shows that the HP granulite-facies metamorphism occurred at ca. 431Ma and the early retrograde amphibolite-facies overprint at ca. 403Ma. Thus the investigated mafic rocks here reveal a clockwise P–T–t path involving burial heating before peak granulite-facies metamorphism and subsequent decompression–cooling with an uplift rate of ca. 0.8km/Ma. This, together with a continental affinity of the HP metamorphic rocks, indicates that the Dunhuang block experienced a collisional orogenesis during the early Paleozoic.
[Display omitted]
•The Dunhuang HP granulite underwent the four stages of metamorphism.•The HP granulite has a clockwise metamorphic P–T–t path.•The HP granulite has a peak-metamorphic age of 431Ma and a retrograde age of 403Ma.•The HP granulite formed by the early Paleozoic collisional orogeny.•The Beishan orogenic collage underwent multiple early Paleozoic collisional processes.</description><subject>Beishan orogenic collage</subject><subject>CAOB</subject><subject>Dunhuang block</subject><subject>Early Paleozoic</subject><subject>HP granulite</subject><subject>P–T–t path</subject><issn>0024-4937</issn><issn>1872-6143</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNp9UUuOEzEQbSGQCAM3YOHlsOjgX9seFkgoDAzSILIIa8vtrk4c3Haw3ZGGFXfgGpyKk-BWWCNVqVSqeq8-r2leErwmmIjXx7V35RDzmmLC15hWw4-aFVGStoJw9rhZYUx5y2-YfNo8y_mIa846smp-f4ZipphOB2fR9s_PX7vqBcE5-rm4GFAc0WTGWrzbon0yYa6jICMXUDkACjHVYHKBFFCG_QShLJCltjPJTWiTTKk01-_ncJhN2KPeR_vt1Rt0e3YDBAtojAmBSf4BbY2H-CPWYTaG4kIlMx7luR9muyzzvHkyGp_hxb941Xz9cLvb3LX3Xz5-2ry7bw0TtLTdDZZ9r3opiFWYdz1nYDrMpKFKDBz4SMHyQUpuOyl4J9jAlMWsByqsUSO7aq4vvKcUv8-Qi55ctuC9CRDnrInkQiklMK-t_NJqU8w5wahP9WqTHjTBehFHH_VFHL2IozGthivs7QUG9Yyzg6Szdcs3BpfAFj1E93-Cv4zYnx8</recordid><startdate>20140501</startdate><enddate>20140501</enddate><creator>He, Zhenyu</creator><creator>Zhang, Zeming</creator><creator>Zong, Keqing</creator><creator>Xiang, Hua</creator><creator>Klemd, R.</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope></search><sort><creationdate>20140501</creationdate><title>Metamorphic P–T–t evolution of mafic HP granulites in the northeastern segment of the Tarim Craton (Dunhuang block): Evidence for early Paleozoic continental subduction</title><author>He, Zhenyu ; Zhang, Zeming ; Zong, Keqing ; Xiang, Hua ; Klemd, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a362t-5907bb8b761c8045b43ea5037a286d4e4f2ec4d774c5764563d38c03be26ca8f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Beishan orogenic collage</topic><topic>CAOB</topic><topic>Dunhuang block</topic><topic>Early Paleozoic</topic><topic>HP granulite</topic><topic>P–T–t path</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>He, Zhenyu</creatorcontrib><creatorcontrib>Zhang, Zeming</creatorcontrib><creatorcontrib>Zong, Keqing</creatorcontrib><creatorcontrib>Xiang, Hua</creatorcontrib><creatorcontrib>Klemd, R.</creatorcontrib><collection>CrossRef</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Lithos</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>He, Zhenyu</au><au>Zhang, Zeming</au><au>Zong, Keqing</au><au>Xiang, Hua</au><au>Klemd, R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Metamorphic P–T–t evolution of mafic HP granulites in the northeastern segment of the Tarim Craton (Dunhuang block): Evidence for early Paleozoic continental subduction</atitle><jtitle>Lithos</jtitle><date>2014-05-01</date><risdate>2014</risdate><volume>196-197</volume><spage>1</spage><epage>13</epage><pages>1-13</pages><issn>0024-4937</issn><eissn>1872-6143</eissn><abstract>The Dunhuang block, which constitutes the northeastern segment of the Tarim Craton, is located between the Central Asian Orogenic Belt (CAOB) to the north and the Altyn–Qilian Orogenic Belt to the south. The present study reveals that the early Paleozoic HP mafic granulites from the Dunhuang block underwent four stages of metamorphism: prograde amphibolite-facies (M1), peak high-pressure (HP) granulite-facies (M2) and two late stages of amphibolite-facies retrograde metamorphism. Based on phase equilibrium modeling, P–T conditions of the four stages of metamorphism are estimated at 720–750°C and 11–13kbar, 760–800°C and 14–16kbar, 690–720°C and 8–8.5kbar, and at <6kbar and <640°C respectively. Peak granulite-facies metamorphism is characterized by a low geothermal gradient of ca. 16°C/km. Zircon U–Pb dating shows that the HP granulite-facies metamorphism occurred at ca. 431Ma and the early retrograde amphibolite-facies overprint at ca. 403Ma. Thus the investigated mafic rocks here reveal a clockwise P–T–t path involving burial heating before peak granulite-facies metamorphism and subsequent decompression–cooling with an uplift rate of ca. 0.8km/Ma. This, together with a continental affinity of the HP metamorphic rocks, indicates that the Dunhuang block experienced a collisional orogenesis during the early Paleozoic.
[Display omitted]
•The Dunhuang HP granulite underwent the four stages of metamorphism.•The HP granulite has a clockwise metamorphic P–T–t path.•The HP granulite has a peak-metamorphic age of 431Ma and a retrograde age of 403Ma.•The HP granulite formed by the early Paleozoic collisional orogeny.•The Beishan orogenic collage underwent multiple early Paleozoic collisional processes.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.lithos.2014.02.020</doi><tpages>13</tpages></addata></record> |
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| subjects | Beishan orogenic collage CAOB Dunhuang block Early Paleozoic HP granulite P–T–t path |
| title | Metamorphic P–T–t evolution of mafic HP granulites in the northeastern segment of the Tarim Craton (Dunhuang block): Evidence for early Paleozoic continental subduction |
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