Mesoproterozoic juvenile mafic¨Cultramafic magmatism in the SW Amazonian Craton (Rio Negro-Juruena province): SHRIMP U¨CPb geochronology and Nd¨CSr constraints of the Figueira Branca Suite

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• 作者：Wilson  ; Teixeira^a ;   ; ^{wteixeir@usp.br} ; Mauro C.  ; Geraldes^b ; Manoel S.  ; D&rsquo ; Agrella-Filho^c ; Joã ; o O.S.  ; Santos^d ; Má ; rcia A.  ; Sant&rsquo ; Ana Barros^e ; Amarildo S.  ; Ruiz^e ; Paulo C.  ; Corrê ; a da Costa^e
• 关键词：Amazonian Craton ; Mesoproterozoic ; Figueira Branca Suite ; U&ndash ; Pb and ⁴⁰Ar&ndash ; ³⁹Ar ages ; Nd&ndash ; Sr isotopes
• 刊名：Journal of South American Earth Sciences
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：32
• 期：4
• 页码：309-323
• 全文大小：1871 K

文摘

The Figueira Branca Suite (FBS) comprises a layered mafic¨Cultramafic complex which together with mafic¨Cfelsic plugs makes up a string of NW-trending intrusive bodies that are emplaced into the Jauru domain (Rio Negro-Juruena province; 1.80?.60 Ga). This domain comprises Orosirian calc-alkaline rocks and coeval metamorphic volcanic¨Csedimentary associations, intruded by voluminous granitoid plutons resulted from outboard Cachoeirinha (1587?522 Ma) and Santa Helena (1485?420 Ma) accretionary orogens that eventually created the Rondonian-San Ignacio province along the SW margin of the proto-Amazonian Craton. SHRIMP U¨CPb age in zircon for one cumulatic gabbro from the FBS yielded a concordia intercept age of 1425.5 ¡À 8.0 Ma (MSWD = 1.11). Another gabbroic plug which crops out to the East gives a similar within error concordia intercept zircon age of 1415.9 ¡À 6.9 Ma (MSWD = 0.25), whereas a nearby monzogranite yields a concordia intercept zircon age of 1428.9 ¡À 2.8 Ma (MSWD = 1.30). All these results are crystallization ages and constrain an important intraplate magmatic event within the Orosirian continental crust at the time of outboard Santa Helena orogen. On the other hand, igneous titanite from another gabbro located to the West of the FBS yielded a weighted mean ²⁰⁷Pb/²⁰⁶Pb crystallization age of 1541 ¡À 23 Ma (MSWD = 0.74). Therefore this rock is not genetically associated with the FBS, as previously suggested by the field information. Additional Nd¨CSr isotopic analyses of the FBS mafic¨Cultramafic rocks and coeval gabbro showed comparable ?_Nd(1.42Ga) values (+3.0 to?+4.7) and variable ?_Sr(1.42Ga) ones (?9.1 to??.1). These data plot in the depleted field quadrant of the Nd¨CSr diagram, indicating a significant influence of the MORB end-member reservoir in the magma genesis. This interpretation is similarly supported by comparison of the Nd evolutionary path of the FBS with those that characterize the isotopic evolution of the Jauru crust and the Cachoeirinha and Santa Helena intrusive plutons. The bulk isotopic signature allows the genetic relationship among the Santa Helena Suite and the FBS and coeval rocks. The anorogenic character of the FBS is supported by the geologic framework of the Jauru domain, given that the emplacement took place under an extensional regime, associated with the recognized regional NW-trending structures. ⁴⁰Ar?sup xmlns="""">39Ar analyses were carried out in mafic rocks that are assigned to the FBS. Biotite from a gabbronorite yielded an ideogram age of 1222 ¡À 5 Ma while a nearby troctolite yielded plateau biotite ages of 1275 ¡À 4 Ma and 1268 ¡À 4 Ma. These ages are minimum estimates of the regional cooling of the FBS. One gabbro of the Alto Jauru Group yields a ⁴⁰Ar?sup xmlns="""">39Ar plateau age of 1781 ¡À 15 Ma, interpreted as the time of regional cooling that succeeded continental accretion and metamorphism at Orosirian times. Later on heterogenous crustal thickening and uplift took place from West to East, as response from the Cachoeirinha and Santa Helena orogen dynamics, which is marked by the 1539?510 Ma and 1452?322 Ma ⁴⁰Ar?sup xmlns="""">39Ar age-patterns, respectively. The available apparent ages suggest that Cachoeirinha crust was subjected to a fast exhumation rate (ca. 50 m.y.), as estimated by the zircon¨Ctitanite¨Chornblende¨Cbiotite time-path, while the Santa Helena crust seems to display a lower exhumation rate. Particularly, the youngest ⁴⁰Ar?sup xmlns="""">39Ar biotite age (1322 Ma) available for the Santa Helena crust signals the post-tectonic phase of the Rondonian-San Ignacio province.