Fifty‐five‐million‐year history of oceanic subduction and exhumation at the northern edge of the Caribbean plate (Sierra del Convento mélange, Cuba)

Fifty‐five‐million‐year history of oceanic subduction and exhumation at the northern edge of the Caribbean plate (Sierra del Convento mélange, Cuba)
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加勒比板块北缘5500万年海洋俯冲和折返历史(古巴Sierra del Convento mélange)

DOI:
10.1111/j.1525-1314.2008.00800.x
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发表时间:
2009
影响因子:
3.4
通讯作者:
Turralde-Vinent
Turralde-Vinent
中科院分区:
地球科学1区
文献类型:
--
作者:
Lázaro;García-Casco;Rojas-Agramonte;Kröner;Neubauer;Turralde-Vinent

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来自Sierra del Convento(古巴东部)蛇纹质混杂岩的六个具有代表性的外来角闪岩块和相关英云闪长岩-奥长花岗岩样品的岩石学和地质年代学数据表明,在炎热和年轻的俯冲带中俯冲的物质具有典型的逆时针P-Tpaths。达到的峰值条件是15750 °C和15千巴,与在斜长角闪岩中观察到的英云闪长质部分熔体的产生相一致。  英云闪长岩巨砾的锆石U-Pb结晶年龄为112.8 ± 1.1 Ma,角闪石的Ar/Ar定年得到两组冷却年龄,分别为106-97 Ma(解释为变质/岩浆闪长岩的冷却)和87-83 Ma(解释为退变质叠印的生长/冷却)。     这些地质年代学数据,结合其他已发表的数据,可以确定该地区的俯冲和折返历史如下:(i)俯冲开始时的热俯冲阶段(120-115 Ma);(ii)相对快速的近等压冷却(25 °C Myr−1)(115-107 Ma),在块体吸积到上板块岩石圈地幔之后;(iii)俯冲通道中缓慢的同步俯冲冷却(4 °C Myr−1)和折返(0.7 km Myr−1)(107-70 Ma);以及(iv)快速的同步碰撞冷却(74 °C Myr−1)和折返(5 km Myr−1)(70-60 Ma)。              
Petrological and geochronological data of six representative samples of exotic blocks of amphibolite and associated tonalite‐trondhjemite from the serpentinitic mélange of the Sierra del Convento (eastern Cuba) indicate counterclockwiseP–Tpaths typical of material subducted in hot and young subduction zones. Peak conditions attained were ∼750 °C and 15 kbar, consistent with the generation of tonalitic partial melts observed in amphibolite. A tonalite boulder provides a U‐Pb zircon crystallization age of 112.8 ± 1.1 Ma, and Ar/Ar amphibole dating yielded two groups of cooling ages of 106–97 Ma (interpreted as cooling of metamorphic/magmatic pargasite) and 87–83 Ma (interpreted as growth/cooling of retrograde overprints). These geochronological data, in combination with other published data, allow the following history of subduction and exhumation to be established in the region: (i) a stage of hot subduction 120–115 Ma, developed upon onset of subduction; (ii) relatively fast near‐isobaric cooling (25 °C Myr−1) 115–107 Ma, after accretion of the blocks to the upper plate lithospheric mantle; (iii) slow syn‐subduction cooling (4 °C Myr−1) and exhumation (0.7 km Myr−1) in the subduction channel 107–70 Ma; and (iv) fast syn‐collision cooling (74 °C Myr−1) and exhumation (5 km Myr−1) 70–60 Ma.
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