Paleomagnetism of the Samar Ophiolite: Implications for the Cretaceous sub-equatorial position of the Philippine island arc

Balmater, Hertz G.; Manalo, Pearlyn C.; Faustino-Eslava, Decibel V.; Queaño, Karlo L.; Dimalanta, Carla B.; Guotana, Juan Miguel; Ramos, Noelynna T.; Payot, Betchaida D.; Yumul, Graciano P.

doi:10.1016/j.tecto.2015.09.024

Cited by 17 publications

(12 citation statements)

References 53 publications

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“…However, due to the poor preservation of seafloor spreading histories, Zahirovic et al () proposed an alternative scenario, where East Java, West Sulawesi, and eastern Borneo originate from the Argo Abyssal Plain on the NW Shelf of Australia, which is adopted in Zahirovic et al (). In addition, the Sepik and Philippine Arcs are attached to New Guinea before moving northward in Zahirovic et al (), and the north margin was an active margin character, which is consistent with the age and geochemistry of the Central Ophiolite Belt on New Guinea (Permana, ) and also the magmatic and paleomagnetic history of the Philippine Arc (Balmater et al, ; Deng et al, ). Another major change in Zahirovic et al () is that the peak of (ultra) high‐pressure metamorphics in the Luk‐Ulo suture zone on East Java at ~115 Ma is reinterpreted to be the onset of subduction of the Woyla Sea backarc, rather than the previously interpreted collision of the East Java, West Sulawesi, and the Woyla intraoceanic arc in Müller, Seton, et al ().…”

Section: Methodssupporting

confidence: 54%

The Dynamic Topography of Eastern China Since the Latest Jurassic Period

et al. 2018

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Some changes in the topography of eastern China since Late Jurassic times cannot be well explained by lithospheric deformation. Here we analyze global mantle flow models to investigate how mantle-driven long-wavelength topography may have contributed to shaping the surface topography of eastern China. Paleodrainage directions suggest that a southward tilted topography once existed in eastern north China in the latest Jurassic Period, which is different from that at present day (southeastward tilting). Our model dynamic topography reveals a southward tilting topography between 160 and 150 Ma, followed by southeastward tilting and rapid subsidence, which is compatible with paleodrainage directions and tectonic subsidence of the Ordos Basin. The Cretaceous anomalous subsidence of the Songliao and North Yellow Sea basins, as well as the Cenozoic anomalous subsidence of the East China Sea Shelf Basin, can also be explained by dynamic topography. An apatite fission track study in the Taihang Mountains reveals four stages of evolution: Late Jurassic fast unroofing, Cretaceous slow unroofing, early Cenozoic fast unroofing, and late Cenozoic slow unroofing. We propose that mantle flow influenced this surface unroofing because the model predicts Late Jurassic dynamic uplift, Cretaceous dynamic subsidence, early Cenozoic dynamic uplift, and late Cenozoic dynamic subsidence. Apatite fission track data from northern south China are also in reasonable agreement with predicted dynamic topography between 80 and 30 Ma. The spatial and temporal agreement between geological observations and model dynamic topography indicates that mantle flow has had a significant influence in shaping the surface topography of eastern China.

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Section: Methodssupporting

confidence: 54%

The Dynamic Topography of Eastern China Since the Latest Jurassic Period

et al. 2018

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“…The northern East Asian Sea coined by these authors could also refer to the ‘proto‐Philippine Sea’ plate. However, in this study, the proto‐Philippine Sea plate was located at lower latitudes, specifically a few degrees north of the equator down to 15°S based on recent palaeomagnetic and geochemical data (Balmater et al , 2015; Guotana, et al , 2017; Dimalanta et al , 2019). The Cenozoic basin of Pubellier et al (2003) corresponds to the Philippine Sea Plate which developed at the northern margin of Australia (Pubellier et al , 2003).…”

Section: Discussionmentioning

confidence: 78%

“…Dimalanta et al (2019) suggested that the proto‐Philippine Sea Plate could have been part of a larger Mesozoic oceanic basin associated with the Mesotethys and the palaeo‐Pacific plate that subducted towards the Eurasian‐Sundaland continent. Obducted sections of oceanic crusts generated from the proto‐Philippine Sea plate could be observed at the central and eastern parts of the Philippine Archipelago (Balmater et al , 2015; Guotana, et al , 2017; Dimalanta et al , 2019).…”

Section: Discussionmentioning

confidence: 99%

Geochemistry of the Late Cretaceous Pandan Formation in Cebu Island, Central Philippines: Sediment contributions from the Australian plate margin during the Mesozoic

Rodrigo

Gabo‐Ratio

Queaño

et al. 2020

The Depositional Record

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The Late Cretaceous Pandan Formation in Cebu Island is one of the oldest sedimentary units in the Central Philippines. The inconsistencies in geological descriptions and interpretation of the depositional environment of the Pandan Formation complicated efforts to determine the origin and tectonic history of the basement of Cebu Island. This study therefore looks into the petrological and geochemical characteristics of the Pandan Formation and their implications for the tectonic development of the Philippine Arc during the late Mesozoic. Petrographic analyses indicate significant contribution from mafic sources with additional inputs from felsic rocks, siliciclastics and metamorphic sources. Enrichment of detrital quartz from felsic volcanic and plutonic rocks, as well as from siliciclastic and metamorphic sources, has shifted the SiO 2 composition of the Pandan clastics from a mafic to a more intermediate source. Whole-rock geochemical analyses revealed low SiO 2 /Al 2 O 3 = 4.21, low K 2 O/Na 2 O = 1.16, low Th/Sc = 0.13, low Th/U = 2.78, high La/Th = 4.51, significantly low REEs = ca 76.45 ppm and low La N /Yb N = 4.28. A slight negative chondrite-normalized Eu/Eu* (0.91) anomaly and significantly high PAAS-normalized positive Eu/Eu* (1.39) values are consistent with derivation from a young undissected magmatic arc terrane. Tectonic discrimination diagrams suggest formation in an oceanic island arc to active margin/collision zone modelled to be located at the oceanic leading edge of Australia. Rapid uplift and erosion of the magmatic arc and older allochthonous blocks gave way to the rapid deposition of the Pandan Formation in the Late Cretaceous at the subequatorial region. K E Y W O R D S Australian Plate margin, Mesozoic, provenance, whole-rock and trace element geochemistry 310 | RODRIGO et al. ful to Messrs. Russyl Bryile Anthony Lanzaderas, Felix F I G U R E 1 1 Tectonic model showing the location of the proto-Philippine arc and the East Philippine-Daito arc from Late Jurassic to Late Cretaceous. The fore-arc basin shown on the map corresponds to the depositional basin of the Pandan Formation. Map modified from Deng et al. (2015) | 327 RODRIGO et al.

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“…This base model is modified to test the potential north-south extent of the Sepik back-arc basin, and also to test alternative timings of the collision between the Sepik terrane and New Guinea. Constraints on the upper end-member extent of the Sepik backarc are based on Philippine Arc paleo-latitude data from Balmater et al (2015) and Queano et al (2007) (Fig. 3), as well as kinematic constraints implemented for both 30 Ma and 50 Ma collision models.…”

Section: Plate Tectonic Reconstructionsmentioning

confidence: 99%

“…(a) Red triangle = Samar ophiolite paleolatitude data of ~14°S ± 6° at ~100 Ma(Balmater et al, 2015), placing a constraint on the maximum opening of the Sepik back-arc basin by this time, and (b) green triangle = Chico River basalt paleolatitude data constraint of ~6°N ± 3° at ~72 Ma(Queano et al, 2007). Due to the opposing subduction zones at this time, spreading between the Sepik terrane and the Philippine Arc is initiated at 80 Ma, to ensure numerical errors are avoided when the plate model is coupled with the geodynamic code.…”

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confidence: 99%

Tectonic and Geodynamic Evolution of the Northern Australian Margin and New Guinea

Tobin

Zahirovic

Hassan

et al. 2018

ASEG Extended Abstracts

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Rapid convergence between the Indo-Australian, Southeast Asian, and Pacific plates in the Cenozoic has resulted in a complex tectonic evolution of Australia's northern margin. A lack of available geologic data leads to large uncertainties, such as the timing of the Sepik collision with the New Guinea margin, currently constrained to sometime between 50 and 30 Ma. Previous work suggested a link between the Sepik collision and a voluminous fast seismic anomaly presently in the mantle beneath Lake Eyre. Following from previous work, this study uses coupled plate reconstruction and numerical geodynamic models to test 50 Ma and 30 Ma collision timings of the Sepik terrane, along with an upper extent back-arc basin, to further refine our understanding of the origin and trajectory of the slab beneath Lake Eyre and address uncertainties in the plate reconstructions. The results of mantle flow models indicate that the Eocene collision timing (~50 Ma) is more likely than an Oligocene collision (~30 Ma). In addition, dynamic topography results support previous suggestions that dynamic subsidence relating to the down-going Sepik slab has influenced the evolution of the Eyre Basin, with up to ~100 m of dynamic subsidence since ~20 Ma. However, further work is required to address numerical issues relating to rapid thermal diffusion of slab material, and to investigate reasonable trench retreat velocities for intermediate (~3000 km) subduction zone lengths. This work highlights the role of numerical experiments in understanding transient plate-mantle processes and their effect on basin evolution.

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Paleomagnetism of the Samar Ophiolite: Implications for the Cretaceous sub-equatorial position of the Philippine island arc

Cited by 17 publications

References 53 publications

The Dynamic Topography of Eastern China Since the Latest Jurassic Period

The Dynamic Topography of Eastern China Since the Latest Jurassic Period

Geochemistry of the Late Cretaceous Pandan Formation in Cebu Island, Central Philippines: Sediment contributions from the Australian plate margin during the Mesozoic

Tectonic and Geodynamic Evolution of the Northern Australian Margin and New Guinea

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