Timing and Evolution of Cretaceous Island Arc Magmatism in Central Cuba: Implications for the History of Arc Systems in the Northwestern Caribbean
Timing and Evolution of Cretaceous Island Arc Magmatism in Central Cuba: Implications for the History of Arc Systems in the Northwestern Caribbean
复制标题
古巴中部白垩纪岛弧岩浆作用的时间和演化：对西北加勒比地区弧系统历史的影响
DOI：
10.1086/662033
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Wingate
中科院分区：
文献类型：
--
作者：
Rojas-Agramonte;Kröner;García-Casco;Iturralde-Vinent;Mattinson;Millán Trujillo;Pérez Rodríguez;Carrasquilla-Ortiz;Wingate
SHRIMP和常规锆石定年对古巴中部白垩纪火山弧系统演化的时间限制。该弧在走向上具有一致的地层，最古老和最深的岩石在南部（与15 -10公里宽的Mabujina斜长角闪岩杂岩[MAC]在构造上接触），而较年轻的岩石在北部。MAC被认为是古巴白垩纪火山弧及其海洋基底暴露最深的部分。我们进行了单锆石年代学研究的五个片麻岩和两个斜长角闪岩的MAC和七个岩石从Manicaragua火山岩，侵入MAC和白垩纪火山弧。Jicaya河奥长花岗质正片麻岩（MAC）的SHRIMP锆石年龄Ma确定了该地区和整个加勒比海（安的列斯）地区花岗岩类岩浆活动的最古老阶段。在前一个样品附近采集的英云闪长质片麻岩的年龄为Ma，另一个英云闪长质片麻岩的年龄为Ma，一个继承锆石的年龄为Ma。MAC中部的两个奥长质正片麻岩的年龄为Ma和Ma，而东部的两个斜长角闪岩的年龄为Ma。93 Ma和315、471、903和1059 Ma的锆石继承性。两个弱片理化的Manicaragua花岗岩类从东部的部分的ESTA和Ma，而五个无片理化的花岗岩类样品从中部和东部的ESTA的，和Ma的年龄。我们的年龄数据支持这样的观点，即Mabujina原始岩是外来的，形成于中豪特里维期前（距今133 Ma）以来沿未变质古巴弧走向沿着NNW的某处。在土伦时期，MAC成为古巴火山弧的一部分。90-93 Ma），当时它被Manicaragua火山岩（Turonian-Campanian; ca. 89-83 Ma）。古巴中部的地质和地质年代学不支持在白垩纪弧形成过程的任何阶段发生极性反转事件的想法。由于我们的大多数测年样本来自狭窄的Mabujina带，极性反转模型意味着新发展的弧（极性相反）的轴将在空间上与旧弧重合，这似乎是不可能的。继承的前寒武纪和古生代的MAC花岗岩类（类似于继承的锆石人口在格雷罗从墨西哥中西部的火山）的锆石建议一个新comian近端设置接近一个火山区（可能是西南墨西哥/玛雅块）的MAC相对于古巴中部的同步原始岛弧的原岩。
SHRIMP and conventional zircon dating place temporal constraints on the evolution of the Cretaceous Volcanic Arc system in central Cuba. The arc has a consistent stratigraphy across strike, with the oldest and deepest rocks in the south (in tectonic contact with the ∼5–10-km-wide Mabujina Amphibolite Complex [MAC]) and younger rocks in the north. The MAC is thought to represent the deepest exposed section of the Cretaceous Volcanic Arc and its oceanic basement in Cuba. We undertook a single zircon geochronological study of five gneisses and two amphibolites from the MAC and seven rocks from the Manicaragua Batholith, which intrudes both the MAC and the Cretaceous Volcanic Arc. A SHRIMP zircon age ofMa for a trondhjemitic orthogneiss (MAC) from the Jicaya River dates the oldest phase of granitoid magmatism in this area and the entire Caribbean (Antillean) region. A tonalitic gneiss collected near the previous sample yielded an age ofMa, and a further tonalitic gneiss had an age ofMa, with one inherited zircon atMa. Two trondhjemitic orthogneisses from the central part of the MAC yielded ages ofandMa, whereas two amphibolites from the eastern part of the complex provided similar ages of ca. 93 Ma and zircon inheritance at 315, 471, 903, and 1059 Ma. Two weakly foliated Manicaragua granitoids from the eastern part of the massif provided ages ofandMa, whereas five unfoliated granitoid samples from the central and eastern part of the massif yielded ages of,,,, andMa. Our age data support the view that the Mabujina Protholiths are exotic and formed somewhere NNW along strike of the nonmetamorphosed Cuban arc since pre–Middle Hauterivian time (before ∼133 Ma). The MAC became part of the Cuban Volcanic Arc during the Turonian (ca. 90–93 Ma), when it was intruded by plutonic rocks of the Manicaragua Batholith (Turonian-Campanian; ca. 89–83 Ma). The geology and geochronology of central Cuba do not support the idea of a polarity reversal event at any stage of the Cretaceous Arc–building process. Because most of our dated samples come from the narrow Mabujina Belt, the polarity reversal model would imply that the axis of a newly developing arc (with opposite polarity) would spatially coincide with the older arc, which appears unlikely. Inherited Precambrian and Palaeozoic zircons in the MAC granitic rocks (similar to inherited zircon populations in the Guerrero terrane from central-western Mexico) suggest a Neocomian proximal setting close to a cratonic area (probably SW Mexico/Maya Block) for the protolith of the MAC relative to the synchronous Primitive Island Arc of central Cuba.
登录
查看更多内容
格雷罗疑似地体（墨西哥西部）和同期弧地体（大安的列斯群岛和哥伦比亚西科迪勒拉山脉）：中生代晚期的洋内弧在白垩纪时期增生到美洲克拉通
DOI：
--
发表时间：
1994
期刊：
影响因子：
--
作者：
M. Tardy;H. Lapierre;C. Freydier;C. Coulon;J. Gill;B. Lépinay;C. Beck;M. O.Talavera;H. E.Ortiz;G. Stein;J. Bourdier;M. Yta
通讯作者：
M. Yta
环加勒比花岗岩：特征和起源
DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
Lidiak EdwardG.;Jolly WayneT.
通讯作者：
Jolly WayneT.
古巴
DOI：
--
发表时间：
1985
期刊：
The Lancet
影响因子：
--
作者：
J. Martí
通讯作者：
J. Martí
加勒比岩浆作用的历史和构造环境
影响因子：
3.9
作者：
T. Donnelly;D. Beets;M. J. Carr;Trevor Jackson;G. Klaver;John Lewis;R. Maury;H. Schellenkens;Alan L. Smith;G. Wadge;D. Westercamp
通讯作者：
D. Westercamp
古巴中北部晚元古代（格伦维尔时代）大陆地壳的 40Ar/39Ar 和 U-Pb 证据及区域构造意义
DOI：
--
发表时间：
1989
期刊：
影响因子：
--
作者：
P. Renne;J. Mattinson;C. Hatten;M. Somin;T. Onstott;G. Millán;E. Linares
通讯作者：
E. Linares