Relative sea-level change in western New Guinea recorded by regional biostratigraphic data

Gold, David P.; White, L.B.; Gunawan, Indra; BouDagher‐Fadel, Marcelle K.

doi:10.1016/j.marpetgeo.2017.07.016

Cited by 29 publications

(27 citation statements)

References 40 publications

(1 reference statement)

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“…A plate boundary has existed north of New Guinea since the Devonian where New Guinea represented the northern edge of eastern Gondwana (e.g., Baldwin et al, ; Davies, ; Gunawan et al, ; Jost et al, ; Webb & White, ). However, widespread deposition of carbonate sequences along the northern margin of New Guinea during the Cretaceous to early Eocene indicates that there was a period of relative tectonic quiescence on the southern (“Australian”) side of the plate boundary during this time (e.g., Gold, White, et al, ; Pieters et al, ; Visser & Hermes, ). Tectonic activity commenced once more in the mid–late Eocene with the final separation of the Australian and Antarctic plates at ~45 Ma (van den Ende et al, ; White et al, ) and subsequent rapid northward movement of Australian Plate (e.g., Schellart & Spakman, ; Schellart, ).…”

Section: Geologic Settingmentioning

confidence: 99%

Tectonic Mode Switches Recorded at the Northern Edge of the Australian Plate During the Pliocene and Pleistocene

et al. 2019

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We report new data from medium-high grade metamorphic rocks found at the northern margin of the Lengguru Fold Belt in West Papua. The study involved a systematic analysis of cross-cutting structures to establish the relative timing of deformation, together with isotopic dating to define when these tectono-thermal events occurred. These data show that the region underwent multiple episodes of deformation within the last six million years. Metamorphic mineral growth was associated with the development of ductile shear zones. This episode occurred during a phase of crustal stretching associated with the formation of a metamorphic core complex. Metamorphic zircon growth at 4.9 to 5.3 Ma was documented in two of the dated samples. These data are interpreted to postdate the peak pressure and temperature conditions of the phase of regional crustal stretching. The shear fabrics associated with the metamorphic core complex were later overprinted by at least two generations of folds. The change in mode from crustal extension to shortening reflects a tectonic mode switch. A subsequent mode switch is documented by numerous brittle extensional faults that cross-cut the earlier formed ductile fabrics. We interpret ca. 0.75-1.51 Ma (U-Th)/He age data to reflect cooling associated with the later stages of crustal shortening (marked by folds) or the later extensional unroofing of the peninsula. This work demonstrates that an orogen can record multiple tectonic mode switches within several million years. These outcomes should be considered in studies of ancient orogens where analytical uncertainties associated with isotopic dating may mask short-lived mode switches.Plain Language Summary How much time is required for a mountain belt to develop? Our knowledge of mountain building is somewhat limited because many of the best-studied mountain belts are quite old and our ability to date tectonic events is less precise the farther back we look through time. The work presented here investigates a mountainous peninsula that developed at the northern margin of the Australian Plate within the last six million years. This region records multiple episodes of deformation-we show that the relatively young rocks have been stretched, then pushed together and then stretched again (much like an accordion). These cycles must occur over a period of one to two million years, which is very fast compared to numerous studies of ancient mountain belts that consider the same processes occur over tens of millions of years.

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Section: Geologic Settingmentioning

confidence: 99%

Tectonic Mode Switches Recorded at the Northern Edge of the Australian Plate During the Pliocene and Pleistocene

et al. 2019

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“…However, the extent of land during the past million years remains unclear as does the origins of Exocelina species in the region. Gold, White, Gunawan, and BouDagher‐Fadel () present models suggesting a landmass larger than the present‐day Birds Head in the Oligo‐Miocene. However, much of the region has been subaerial since the Late Pliocene possibly associated with a larger landmass possibly again by marine intrusions in the Pleistocene.…”

Section: Discussionmentioning

confidence: 91%

“…A third hypothesis is that colonization of the Birds Head area might have occurred when the region consisted of several islands (e.g., in the Pleistocene, Gold et al. (), with populations adapting to local environmental factors.…”

Section: Discussionmentioning

confidence: 99%

“…In an alternative way, a reduction of gene flow could be due to occasional vicariance events, such as marine intrusions, ongoing orogeny or regional fluctuations of microclimates. A third hypothesis is that colonization of the Birds Head area might have occurred when the region consisted of several islands (e.g., in the Pleistocene, Gold et al (2017), with populations adapting to local environmental factors.…”

Section: Discussionmentioning

confidence: 99%

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Phylogeography and population genomics of a lotic water beetle across a complex tropical landscape

et al. 2018

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The habitat template concept applied to a freshwater system indicates that lotic species, or those which occupy permanent habitats along stream courses, are less dispersive than lentic species, or those that occur in more ephemeral aquatic habitats. Thus, populations of lotic species will be more structured than those of lentic species. Stream courses include both flowing water and small, stagnant microhabitats that can provide refuge when streams are low. Many species occur in these microhabitats but remain poorly studied. Here, we present population genetic data for one such species, the tropical diving beetle Exocelina manokwariensis (Dytiscidae), sampled from six localities along a ~300 km transect across the Birds Head Peninsula of New Guinea. Molecular data from both mitochondrial (CO1 sequences) and nuclear (ddRAD loci) regions document fine-scale population structure across populations that are ~45 km apart. Our results are concordant with previous phylogenetic and macroecological studies that applied the habitat template concept to aquatic systems. This study also illustrates that these diverse but mostly overlooked microhabitats are promising study systems in freshwater ecology and evolutionary biology. With the advent of next-generation sequencing, fine-scale population genomic studies are feasible for small nonmodel organisms to help illuminate the effect of habitat stability on species' natural history, population structure and geographic distribution.

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“…Tracing the stratigraphic distribution of the larger benthic foraminifera allows the understanding of the impact of climate, tectonic activity and volcanism on long-term (i.e. millions years) evolution of these shallow-water carbonate platforms (Courgeon et al, 2016(Courgeon et al, , 2017Gold et al, 2017aGold et al, , 2017b. Larger foraminifera and planktonic foraminifera overlap in occurrence in many localities allowing direct comparison of larger foraminifera "letter stages" biozones with oceanic planktonic scales (BouDagher-Fadel, 2002;BouDagher-Fadel, 2013, 2015Sharaf et al, 2013).…”

Section: Biostratigraphy and Phylogenetic Evolutionmentioning

confidence: 99%

Evolution and Geological Significance of Larger Benthic Foraminifera

2018

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Relative sea-level change in western New Guinea recorded by regional biostratigraphic data

Abstract: 27We present new biostratigraphic analyses of approximately 200 outcrop samples 28 across western New Guinea. These data were used to reconstruct palaeogeography

Cited by 29 publications

References 40 publications

Tectonic Mode Switches Recorded at the Northern Edge of the Australian Plate During the Pliocene and Pleistocene

Tectonic Mode Switches Recorded at the Northern Edge of the Australian Plate During the Pliocene and Pleistocene

Phylogeography and population genomics of a lotic water beetle across a complex tropical landscape

Evolution and Geological Significance of Larger Benthic Foraminifera

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