The contribution of the young Cretaceous Caribbean Oceanic Plateau to the genesis of late Cretaceous arc magmatism in the Cordillera Occidental of Ecuador

2008 ◽  
Vol 26 (4) ◽  
pp. 355-368 ◽  
Author(s):  
J. Allibon ◽  
P. Monjoie ◽  
H. Lapierre ◽  
E. Jaillard ◽  
F. Bussy ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Arc Magmatism ◽  
Oceanic Plateau

Zircon U–Pb geochronology, mineral and whole‐rock geochemistry of the Khardung volcanics, Ladakh Himalaya, India: Implications for Late Cretaceous to Palaeogene continental arc magmatism

2019 ◽  
Vol 55 (5) ◽  
pp. 3297-3320 ◽  
Author(s):  
Nongmaithem Lakhan ◽  
Athokpam Krishnakanta Singh ◽  
Birendra Pratap Singh ◽  
Koushik Sen ◽  
Mutum Rajanikanta Singh ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Arc Magmatism ◽  
Continental Arc ◽  
Ladakh Himalaya ◽  
Continental Arc Magmatism

scholarly journals Pervasive mantle plume head heterogeneity: Evidence from the late Cretaceous Caribbean-Colombian oceanic plateau

2002 ◽  
Vol 107 (B7) ◽  
pp. ECV 2-1-ECV 2-13 ◽  
Author(s):  
Andrew C. Kerr ◽  
John Tarney ◽  
Pamela D. Kempton ◽  
Piera Spadea ◽  
Alvaro Nivia ◽  
...  
Keyword(s):  
Mantle Plume ◽  
Late Cretaceous ◽  
Oceanic Plateau

The geochemistry and petrogenesis of the late-Cretaceous picrites and basalts of Curaçao, Netherlands Antilles: a remnant of an oceanic plateau

1996 ◽  
Vol 124 (1) ◽  
pp. 29-43 ◽  
Author(s):  
A. C. Kerr ◽  
John Tarney ◽  
Giselle F. Marriner ◽  
Gerard T. Klaver ◽  
Andrew D. Saunders ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Netherlands Antilles ◽  
Oceanic Plateau

Obduction, subduction and collision as reflected in the Upper Cretaceous–Lower Eocene sedimentary record of western Turkey

2001 ◽  
Vol 138 (2) ◽  
pp. 117-142 ◽  
Author(s):  
ARAL I. OKAY ◽  
İZVER TANSEL ◽  
OKAN TÜYSÜZ
Keyword(s):  
Late Cretaceous ◽  
Upper Cretaceous ◽  
Volcanic Rocks ◽  
Passive Margin ◽  
The Black Sea ◽  
Western Anatolia ◽  
Arc Magmatism ◽  
Sedimentary Record ◽  
Western Turkey ◽  
Lower Eocene

Late Cretaceous–Early Eocene Tethyan evolution of western Turkey is characterized by ophiolite obduction, high-pressure/low-temperature metamorphism, subduction, arc magmatism and continent–continent collision. The imprints of these events in the Upper Cretaceous–Lower Eocene sedimentary record of western Anatolia are studied in thirty-eight well-described stratigraphic sections. During the Late Cretaceous period, western Turkey consisted of two continents, the Pontides in the north and the Anatolide-Taurides in the south. These continental masses were separated by the İzmir-Ankara Neo-Tethyan ocean. During the convergence the Pontides formed the upper plate, the Anatolide-Taurides the lower plate. The arc magmatism in the Pontides along the Black Sea coast is biostratigraphically tightly constrained in time between the late Turonian and latest Campanian. Ophiolite obduction over the passive margin of the Anatolide-Tauride Block started in the Santonian soon after the inception of subduction in the Turonian. As a result, large areas of the Anatolide-Tauride Block subsided and became a region of pelagic carbonate sedimentation during the Campanian. The leading margin of the Anatolide-Tauride Block was buried deeply and was deformed and metamorphosed to blueschist facies during Campanian times. The Campanian arc volcanic rocks in the Pontides are conformably overlain by shaley limestone of Maastrichtian–Palaeocene age. However, Maastrichtian sedimentary sequences north of the Tethyan suture are of fore-arc type suggesting that although arc magmatism ceased by the end of the Campanian age, continent–continent collision was delayed until Palaeocene time, when there was a change from marine to continental sedimentation in the fore-arc basins. The interval between the end of the arc magmatism and continent–continent collision may have been related to a northward jump of the subduction zone at the end of Campanian time, or to continued obduction during the Maastrichtian.

scholarly journals Cretaceous to Miocene magmatism, sedimentation, and exhumation within the Alaska Range suture zone: A polyphase reactivated terrane boundary

Geosphere ◽  
2019 ◽  
Vol 15 (4) ◽  
pp. 1066-1101 ◽  
Author(s):  
Jeffrey M. Trop ◽  
Jeff Benowitz ◽  
Ronald B. Cole ◽  
Paul O’Sullivan
Keyword(s):  
Late Cretaceous ◽  
Detrital Zircon ◽  
Volcanic Rocks ◽  
Strike Slip ◽  
Suture Zone ◽  
Fault System ◽  
Arc Magmatism ◽  
Alaska Range ◽  
Denali Fault ◽  
Dike Swarms

AbstractThe Alaska Range suture zone exposes Cretaceous to Quaternary marine and nonmarine sedimentary and volcanic rocks sandwiched between oceanic rocks of the accreted Wrangellia composite terrane to the south and older continental terranes to the north. New U-Pb zircon ages, 40Ar/39Ar, ZHe, and AFT cooling ages, geochemical compositions, and geological field observations from these rocks provide improved constraints on the timing of Cretaceous to Miocene magmatism, sedimentation, and deformation within the collisional suture zone. Our results bear on the unclear displacement history of the seismically active Denali fault, which bisects the suture zone. Newly identified tuffs north of the Denali fault in sedimentary strata of the Cantwell Formation yield ca. 72 to ca. 68 Ma U-Pb zircon ages. Lavas sampled south of the Denali fault yield ca. 69 Ma 40Ar/39Ar ages and geochemical compositions typical of arc assemblages, ranging from basalt-andesite-trachyte, relatively high-K, and high concentrations of incompatible elements attributed to slab contribution (e.g., high Cs, Ba, and Th). The Late Cretaceous lavas and bentonites, together with regionally extensive coeval calc-alkaline plutons, record arc magmatism during contractional deformation and metamorphism within the suture zone. Latest Cretaceous volcanic and sedimentary strata are locally overlain by Eocene Teklanika Formation volcanic rocks with geochemical compositions transitional between arc and intraplate affinity. New detrital-zircon data from the modern Teklanika River indicate peak Teklanika volcanism at ca. 57 Ma, which is also reflected in zircon Pb loss in Cantwell Formation bentonites. Teklanika Formation volcanism may reflect hypothesized slab break-off and a Paleocene–Eocene period of a transform margin configuration. Mafic dike swarms were emplaced along the Denali fault from ca. 38 to ca. 25 Ma based on new 40Ar/39Ar ages. Diking along the Denali fault may have been localized by strike-slip extension following a change in direction of the subducting oceanic plate beneath southern Alaska from N-NE to NW at ca. 46–40 Ma. Diking represents the last recorded episode of significant magmatism in the central and eastern Alaska Range, including along the Denali fault. Two tectonic models may explain emplacement of more primitive and less extensive Eocene–Oligocene magmas: delamination of the Late Cretaceous–Paleocene arc root and/or thickened suture zone lithosphere, or a slab window created during possible Paleocene slab break-off. Fluvial strata exposed just south of the Denali fault in the central Alaska Range record synorogenic sedimentation coeval with diking and inferred strike-slip displacement. Deposition occurred ca. 29 Ma based on palynomorphs and the youngest detrital zircons. U-Pb detrital-zircon geochronology and clast compositional data indicate the fluvial strata were derived from sedimentary and igneous bedrock presently exposed within the Alaska Range, including Cretaceous sources presently exposed on the opposite (north) side of the fault. The provenance data may indicate ∼150 km or more of dextral offset of the ca. 29 Ma strata from inferred sediment sources, but different amounts of slip are feasible.Together, the dike swarms and fluvial strata are interpreted to record Oligocene strike-slip movement along the Denali fault system, coeval with strike-slip basin development along other segments of the fault. Diking and sedimentation occurred just prior to the onset of rapid and persistent exhumation ca. 25 Ma across the Alaska Range. This phase of reactivation of the suture zone is interpreted to reflect the translation along and convergence of southern Alaska across the Denali fault driven by highly coupled flat-slab subduction of the Yakutat microplate, which continues to accrete to the southern margin of Alaska. Furthermore, a change in Pacific plate direction and velocity at ca. 25 Ma created a more convergent regime along the apex of the Denali fault curve, likely contributing to the shutting off of near-fault extension-facilitated arc magmatism along this section of the fault system and increased exhumation rates.

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