Nature and genesis of Kalimantan diamonds

Smith, C. B.; Bulanova, G.P.; Kohn, Simon C.; Milledge, H. J.; Hall, A.; Griffin, Brendan; Pearson, D. Graham

doi:10.1016/j.lithos.2009.05.014

Cited by 34 publications

(12 citation statements)

References 25 publications

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“…Separation of these Palaeozoic Cathaysian elements from core SW Borneo led Hall et al (2008), Hall (2009a, 2009b and Metcalfe (2011aMetcalfe ( , 2011b to propose that SW Borneo was derived from NW Australia in the Jurassic. Diamonds occurring in SW Borneo placer deposits without any apparent local source, have geochemical and isotope signatures similar to Australian diamonds (Taylor et al, 1990;Smith et al, 2009;Nico Kueter et al, 2016;White et al, 2016) which would support such a proposition. Van Leeuwen (2014) reviews diamond occurrences in Sundaland and suggests various possible models for the origin of Kalimantan diamonds, including fluvial derivation from mainland Sundaland during the Mesozoic.…”

Section: Sw Borneo Blockmentioning

confidence: 90%

Tectonic evolution of Sundaland

Metcalfe¹

2017

BGSM

190

139

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Section: Sw Borneo Blockmentioning

confidence: 90%

Tectonic evolution of Sundaland

Metcalfe¹

2017

BGSM

190

139

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“…The P-wave model of Li et al (2008) incorporates stations from the Chinese Seismograph Network with global data collated by Engdahl et al (1998), resulting in well-resolved slabs related to circum-Asian subduction zones. The GyPSuM S-wave model from Simmons et al (2009) was used (Supplement Fig. A7), in addition to the P-wave model, to help interpret the subduction histories due to the better sampling of the mantle beneath oceanic regions and the Southern Hemisphere in order to avoid the landcoverage bias of P-wave models (Figs.…”

Section: Seismic Tomographic Constraints In the Cenozoic For The Circmentioning

confidence: 99%

“…Vertical sections from MIT-P(Li et al, 2008) and GyPSuM-S(Simmons et al, 2009) seismic tomography models along profiles A to E (magenta lines). The first-order differences between the P-and S-wave models is that the amplitude of the positive seismic velocity anomalies significantly diminishes away from continental coverage (e.g., dashed lines in profiles A and B).…”

mentioning

confidence: 99%

The Cretaceous and Cenozoic tectonic evolution of Southeast Asia

Zahirovic¹,

Seton²,

Müller³

2013

Preprint

141

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Tectonic reconstructions of Southeast Asia have given rise to numerous controversies that include the accretionary history of Sundaland and the enigmatic tectonic origin of the proto-South China Sea. We assimilate a diversity of geological and geophysical observations into a new regional plate model, coupled to a global model, to address these debates. Our approach takes into account terrane suturing and accretion histories, the location of subducted slabs imaged in mantle tomography in order to constrain the evolution of regional subduction zones, as well as plausible absolute and relative plate velocities and tectonic driving mechanisms. We propose a scenario of rifting from northern Gondwana in the latest Jurassic, driven by northward slab pull from north-dipping subduction of Tethyan crust beneath Eurasia, to detach East Java, Mangkalihat, southeast Borneo and West Sulawesi blocks that collided with a Tethyan intraoceanic subduction zone in the mid-Cretaceous and subsequently accreted to the Sunda margin (i.e., southwest Borneo core) in the Late Cretaceous. In accounting for the evolution of plate boundaries, we propose that the Philippine Sea plate originated on the periphery of Tethyan crust forming this northward conveyor. We implement a revised model for the Tethyan intra-oceanic subduction zones to reconcile convergence rates, changes in volcanism and the obduction of ophiolites. In our model the northward margin of Greater India collides with the Kohistan-Ladakh intra-oceanic arc at ∼ 1000 km beneath northern Borneo and the South China Sea are likely to be remnants of the proto-South China Sea basin.

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“…They serve as important indicators for regional and contact metamorphic P-T conditions from greenschist to granulite-facies P-T conditions. In appropriate bulk compositions, the high-P polymorph kyanite may be stable at upper mantle P-T conditions as evidenced by kyanite inclusions in diamond (e.g., Prinz et al 1975;Smith et al 2009) and the frequent presence of kyanite in mantle eclogites (e.g., Carswell et al 1981;Smyth et al 1989). High P-T experiments (Schmidt et al 1997;Konzett et al 2008) indicate that the upper P-stability limit of kyanite defined by the reaction kyanite = corundum + stishovite is located at P ≥ 12-15 GPa in the T range 800-1500 °C, thus extending the stability of kyanite to transition zone depths of ∼ 360-450 km.…”

Section: Introductionmentioning

confidence: 99%

Pressure-enforced Cr substitution in Cr1+xAl1−xO(SiO4), synthetic analogues of kyanite

et al. 2019

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Cr 3+ can substitute for Al 3+ in the crystal structure of kyanite, Al 2 O(SiO 4). Cr 3+-rich solid solutions along the binary Al 2 O(SiO 4)-Cr 2 O(SiO 4) joint were synthesized under distinct high-pressure conditions. Sample crystals of Cr 1+x Al 1−x O(SiO 4) with x = 0.025(12) and 0.188(8) have been synthesized at pressures of 7 GPa and temperatures up to 1200 °C. Unit-cell dimensions and single-crystal X-ray diffraction of the new Cr 3+-rich kyanite-type phases show a linear increase of lattice parameters a, b and c with increasing Cr 3+ content. Cr 3+ replaces Al 3+ on the octahedrally coordinated M-sites with Cr 3+ preferentially occupying large [MO 6 ]-octahedra. Cr 3+ substitution for Al 3+ is highest on the M3 site in a sequence of Cr 3+ (M3) > Cr 3+ (M2) > Cr 3+ (M1) > Cr 3+ (M4) following the polyhedral volumes V(M3O 6) > V(M2O 6) > V(M1O 6) > V(M4 O 6). The compressibility of Cr 1.19 Al 0.81 O(SiO 4) has been determined via precise lattice parameters up to 6.00(4) GPa. The pressure-volume data fitted to the third-order Birch-Murnaghan equation of state yielded an isothermal bulk modulus (K T0) of 196(16) GPa and a pressure derivative K′ T0 of 2(4) at V 0 = 310.3(1) Å 3. The value of K T0 is in accordance to the Anderson-Anderson relation but it is slightly smaller than the respective value for natural Cr 3+-free kyanite.

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Nature and genesis of Kalimantan diamonds

Cited by 34 publications

References 25 publications

Tectonic evolution of Sundaland

Tectonic evolution of Sundaland

The Cretaceous and Cenozoic tectonic evolution of Southeast Asia

Pressure-enforced Cr substitution in Cr1+xAl1−xO(SiO4), synthetic analogues of kyanite

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