Tracing the depositional history of Kalimantan diamonds by zircon provenance and diamond morphology studies

Kueter, Nico; Soesilo, Joko; Fedortchouk, Yana; Nestola, Fabrizio; Belluco, Lorenzo; Troch, Juliana; Wälle, Marküs; Guillong, Marcel; Quadt, Albrecht von; Driesner, Thomas

doi:10.1016/j.lithos.2016.05.003

Cited by 32 publications

(10 citation statements)

References 78 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: 91%

Tectonic evolution of Sundaland

Metcalfe¹

2017

BGSM

193

139

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Section: Sw Borneo Blockmentioning

confidence: 91%

Tectonic evolution of Sundaland

Metcalfe¹

2017

BGSM

193

139

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“…This is in accordance with the inherited population described by van Dongen et al (2010a), who described these zircons as being directly or erosinally derived from basement rocks similar to the Mount Isa Inlier. Another possibility is that they crystallized during the Halls Creek orogeny (Kueter et al, 2016). In this study, we additionally identified a significant number of Mesozoic (i.e.…”

Section: Origin and Tectonic Setting Of The Ok Tedi Igneous Complexmentioning

confidence: 93%

Magma Evolution Leading to Porphyry Au-Cu Mineralization at the Ok Tedi Deposit, Papua New Guinea: Trace Element Geochemistry and High-Precision Geochronology of Igneous Zircon

et al. 2018

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Geological field relationships combined with spatially resolved geochemistry and high-precision U-Pb geochronology of zircons allow quantification of magmatic processes leading to porphyry emplacement and Au-Cu ore formation at Ok Tedi, the Earth's youngest giant porphyry-skarn deposit. Trace element contents in zircons were obtained by LA-ICP-MS before selected grains were removed from the sample mount, chemically abraded, spiked and dissolved for high precision U-Pb geochronology by CA-ID-TIMS. U-Pb geochronology by LA-SF-ICP-MS on abundant inherited zircon cores that occur in all intrusions together with Hf isotope analyses by solution MC-ICP-MS permitted further assessment of the degree of crustal assimilation of the upper crustal magma reservoir. The combined chemical data and precise ages of zircons indicate closed system fractional crystallization and concurrent cooling in a common magma reservoir, from which the intrusions at Ok Tedi were successively extracted. Inherited zircon populations and Hf isotopic analyses of Pleistocene zircons record lower-crustal assimilation with Proterozoic basement. Based on CL-imaging a chemically distinct zircon population with low Th/U was identified in the youngest syn-ore intrusive rocks. These zircons indicate injection of a distinct magma into the common magma reservoir, which triggered the emplacement of the youngest porphyry, intrusion of a polymictic breccia with partly igneous matrix, and intimately associated hydrothermal Au-Cu mineralization. Ages of chemically characterized zircon crystals extend over a total time span of 212 ± 44 kyr, recording the minimum duration of fractional crystallization in the 2 large magma reservoir from the time it reached zircon saturation. The youngest zircons in each intrusion resolve the emplacement of early diorite intrusions, lowgrade monzodiorite porphyries, including the Sydney monzodiorite and Fubilan porphyry, into three time-resolved pulses separated by a total of ~160 kyr. The Sydney monzodiorite contains barren quartz veins and produced endoskarn and exoskarn; however, the exact timing of skarn-hosted Au-Cu mineralization is not yet clear. The emplacement of the ore-bearing Fubilan porphyry and the intrusive breccia overlap at 1.187 ± 0.022 Ma, constraining the time and duration of porphyry emplacement with associated Au-Cu mineralization. The injection of a distinct, probably more mafic magma batch into the magma reservoir preceded the emplacement of the Fubilan porphyry and the intrusive breccia by less than the resolution of 30 kyr indicating that this event was the immediate trigger for Au-Cu mineralization at Ok Tedi.

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“…An alternative explanation is that the garnet was entrapped at relatively high temperatures, that is, along an isomeke passing close to P inc = 0 at room conditions (see Figure 3b in Angel, Nimis, et al, 2015). Some of these possible explanations might also account for some previously reported garnet inclusions in diamonds, for which P inc ranges from zero (Liu et al, 1990) to values of about 0.3-0.7 GPa (see, e.g., Harris et al, 1970;Küter et al, 2016). Whatever the reason for the null P inc , it is clear that this garnet inclusion cannot be used to retrieve the pressure of entrapment through elastic geobarometry.…”

Section: 1029/2018jb016012mentioning

confidence: 92%

“…Elastic geobarometry has been applied to various types of inclusions in diamonds with variable apparent success (Anzolini et al, , ; Harris et al, ; Howell, ; Howell et al, , ; Howell & Nasdala, ; Izraeli et al, ; Küter et al, ; Nestola et al, ; Sobolev et al, ). Only two of these studies involved eclogitic diamonds, and specifically two coesite inclusions (Howell et al, ; Sobolev et al, ), but they yielded contrasting results, raising doubts as to the suitability of coesite as a reliable geobarometer and/or of Raman spectroscopy as the best technique to determine P inc .…”

Section: Introductionmentioning

confidence: 99%

Toward a Robust Elastic Geobarometry of Kyanite Inclusions in Eclogitic Diamonds

et al. 2018

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Here we report the first results from elastic geobarometry applied to a kyanite inclusion entrapped within an eclogitic diamond (from Voorspoed mine, South Africa) using micro‐Raman and Fourier transform infrared spectroscopy, electron microprobe analysis, ab initio calculations, and finite element modeling. Application of elastic geobarometry to very elastically anisotropic kyanite inclusions is challenging, as current models do not allow for elastic anisotropy. In order to minimize the effects of anisotropy, we have explored the effects of deviatoric stress on Raman modes via ab initio density functional theory. The results allowed us to select the Raman mode (at ca. 638 cm−1) that is the least sensitive to deviatoric stress. The shift of this band in the inclusion while still trapped within the diamond relative to the inclusion in air (once liberated) was used under hydrostatic approximation to determine a residual pressure on the inclusion of 0.184 ± 0.045 GPa and an entrapment pressure of 5.2 ± 0.3 GPa (~160 km depth) for an FTIR N‐aggregation residence temperature of 1119 ± 50 °C. This is the first geothermobarometric determination for a diamond from the Voorspoed kimberlite. It overlaps with P–T estimates obtained by traditional chemical geobarometry for diamonds from other kimberlites from the Kaapvaal craton, suggesting that the hydrostatic approximation does not introduce significant errors in the geobarometric evaluation. Our protocol of Raman peak selection can be used for geobarometry of further kyanite‐bearing diamonds and may provide a guide for more robust geobarometry of other types of mineral inclusions in diamonds, both eclogitic and peridotitic.

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Tracing the depositional history of Kalimantan diamonds by zircon provenance and diamond morphology studies

Cited by 32 publications

References 78 publications

Tectonic evolution of Sundaland

Tectonic evolution of Sundaland

Magma Evolution Leading to Porphyry Au-Cu Mineralization at the Ok Tedi Deposit, Papua New Guinea: Trace Element Geochemistry and High-Precision Geochronology of Igneous Zircon

Toward a Robust Elastic Geobarometry of Kyanite Inclusions in Eclogitic Diamonds

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