Geochemical Perspectives Letters最新文献_第5页

Sr-Nd-Pb isotopes of fluids in diamond record two-stage modification of the continental lithosphere 金刚石流体的Sr-Nd-Pb同位素记录了大陆岩石圈的两期改造

1区地球科学

Geochemical Perspectives Letters Pub Date : 2023-09-01 DOI: 10.7185/geochemlet.2329

Y Weiss, J.M. Koornneef, G.R. Davies

{"title":"Sr-Nd-Pb isotopes of fluids in diamond record two-stage modification of the continental lithosphere","authors":"Y Weiss, J.M. Koornneef, G.R. Davies","doi":"10.7185/geochemlet.2329","DOIUrl":"https://doi.org/10.7185/geochemlet.2329","url":null,"abstract":"Sample Description Seven microinclusion-bearing fibrous diamonds from a single source in Canada were selected for the present study from a private collection of M. Schrauder (Vienna, Austria). The exact origin of these diamonds is unknown; however, based on the year of first mine production compared to when these diamonds were originally acquired (2009), potential mines are Diavik (with an emplacement age of 55‒56 Ma; Graham et al., 1999; Creaser et al., 2004), Ekati (45‒75 Ma; Lockhart et al., 2003; Creaser et al., 2004), Jericho (~172 Ma; Heaman et al., 2002), Victor (170‒180 Ma; Januszczak et al., 2013) or Snap Lake (523‒535 Ma; Agashev et al., 2001; Heaman et al., 2004). The diamonds are all 3 to 4 mm in diameter, vary in weight between 91 to 116 mg, have cubic morphology, and are white to dark grey in colour. Five of the diamonds are fully fibrous whereas two (515 and 516) have a fibrous coat overgrowth on a small microinclusion-free octahedral core (<800 μm across). Each diamond was laser-cut twice to create two parallel side sections and a central thin plate that was polished on both sides; all parts were then cleaned ultrasonically in a mixture of concentrated HF (29 N) and HNO3 (16 N) for >2 h and washed with ethanol and distilled water.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135389325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A magmatic copper and fluid source for the sediment-hosted Mount Isa deposit 沉积型伊萨山矿床的岩浆铜和流体来源

1区地球科学

Geochemical Perspectives Letters Pub Date : 2023-09-01 DOI: 10.7185/geochemlet.2330

I.V. Sanislav, R. Mathur, P. Rea, P.H.G.M. Dirks, B. Mahan, L. Godfrey, H. Degeling

{"title":"A magmatic copper and fluid source for the sediment-hosted Mount Isa deposit","authors":"I.V. Sanislav, R. Mathur, P. Rea, P.H.G.M. Dirks, B. Mahan, L. Godfrey, H. Degeling","doi":"10.7185/geochemlet.2330","DOIUrl":"https://doi.org/10.7185/geochemlet.2330","url":null,"abstract":"Ninety chalcopyrite samples were collected from drill holes across well-known ore bodies and the low-grade envelope around the Mt Isa deposit. The textural position of chalcopyrite grains targeted for analysis were determined before the sulphides were analysed, and sulphides in similar textural positions were compared. Full log and assay data were available for all drill holes. The sampling strategy involved: to sample across the ore body from the core of the ore body to the most distal parts that contain chalcopyrite and to systematically collect samples in relationships with major structures, to sample within the same stratigraphic horizon, to sample across the entire deposit. Chalcopyrite grains were handpicked from each sample at the Juniata College, USA and sampled with a drill dremel tool. Between 10 to 50 mg of chalcopyrite was dissolved in 4 ml of ultrapure, heated, aqua regia overnight. Due to the fact copper is a dominant ion in the mineral, no column chemistry was conducted on the chalcopyrite samples as demonstrated in (Mathur et al., 2005; Zhu et al., 2000; Zhang et al., 2020). Isotope analyses were carried out on MCICP-MS instruments at various facilities (Penn State University, Washington State University and Rutgers University). Cu isotope values were corrected for mass bias using traditional standard–sample–standard bracketing with the NISTSRM976 standard reference material and data are presented in the traditional delta notation (in per mil) compared to this standard. The instruments were in wet-plasma mode and the solutions were measured at 200 ng/g. Samples and reference materials matched to within 30 % of the Cu signal. QA/QC for the results was monitored using an in-house USA coin (1838 USA CENT δCu = 0.01 ± 0.06 ‰ (n=39 combined from all three locations) and BVHO-2 with values overlapping those reported in the literature.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135427674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Contrasting oxygen isotopes in garnet from diamondiferous and barren eclogitic parageneses 钻石异晶榴辉共生岩中石榴石氧同位素对比

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2023-09-01 DOI: 10.7185/geochemlet.2328

N. Korolev, M. Kopylova, E. Dubinina, R. A. Stern, A. Methods

引用次数: 0

A whole-lithosphere view of continental growth 大陆生长的岩石圈整体观

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2023-08-03 DOI: 10.7185/geochemlet.2324

J. Reimink, J. Davies, Jeff Moyen, D. Pearson

{"title":"A whole-lithosphere view of continental growth","authors":"J. Reimink, J. Davies, Jeff Moyen, D. Pearson","doi":"10.7185/geochemlet.2324","DOIUrl":"https://doi.org/10.7185/geochemlet.2324","url":null,"abstract":"Methods Previous Crustal Growth Estimates Previous crustal growth estimates calculated by Dhuime et al., (2012; 2017) are here collectively referred to as D27 and these widely used crustal growth curves are based on a modification of the calculations of Belusova et al. (2010). In the calculation scheme used by D27, an age spectrum was obtained by compiling zircon Hfisotope depleted mantle model extraction ages. Each individual zircon U-Pb + Hf isotope data point was used to calculate a depleted mantle model extraction age, and these model ages were binned across geologic time. This age distribution was corrected for reworking using a modification of the methods employed by (Belousova et al., 2010). Instead of considering only zircon Hf isotope data, D27 used zircon O-isotope data to identify crustal reworking signals in the zircon record where zircon oxygen isotope values above the mantle range were considered to be evidence of a reworking signal. A curve proposed to be the crustal growth rate was calculated by determining the relationship between crustal reworking – identified using zircon Hf isotope model ages – and juvenile crustal growth – identified using O-isotope ratios. These calculations are replicated in Supplementary Table S-2. However, there is a flaw in the calculations employed in the D27 work (as pointed out by (Korenaga, 2018)).","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":" ","pages":""},"PeriodicalIF":4.9,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44306107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Vivianite-parasymplesite solid solution: A sink for arsenic in ferruginous environments? 橄榄石-副橄榄石固溶体:含铁环境中砷的水槽?

1区地球科学

Geochemical Perspectives Letters Pub Date : 2023-08-03 DOI: 10.7185/geochemlet.2325

J.P.H. Perez, M. Okhrymenko, R. Blukis, V. Roddatis, S. Mayanna, J.F.W. Mosselmans, L.G. Benning

引用次数: 0

Corrigendum to “Co-reduction of Fe(III) and S0 drives Fe-S biomineral formation and phosphate mobilisation” by Bronner et al., 2023 Bronner等人于2023年撰写的“Fe(III)和S0的共同还原驱动Fe- s生物矿物形成和磷酸盐动员”的勘误表

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2023-08-01 DOI: 10.7185/geochemlet.2301cor

R. Bronner, K. Thompson, C. Dreher, E. Runge, E. Voggenreiter, J. Shuster, B. Wan, P. Joshi, Stefan Fischer, J. Duda, A. Kappler, M. Mansor

引用次数: 0

Sorption model for yttrium in fluorapatite: Geochemical implications 氟磷灰石对钇的吸附模型：地球化学意义

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2023-08-01 DOI: 10.7185/geochemlet.2326

C. Bonnet, M. Muñoz, O. Mathon, V. Motto-Ros, A. Elghali, F. Parat, J. Aubineau, J. Bodinier

引用次数: 0

Fast REE re-distribution in mantle clinopyroxene via reactive melt infiltration 地幔斜辉石中稀土元素的快速再分布

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2023-07-25 DOI: 10.7185/geochemlet.2323

G. Borghini, P. Fumagalli, F. Arrigoni, E. Rampone, J. Berndt, S. Klemme, M. Tiepolo

引用次数: 0

Dust transport enhanced land surface weatherability in a cooling world 在一个变冷的世界里，尘埃的输送增强了陆地表面的耐候性

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2023-06-01 DOI: 10.7185/geochemlet.2322

Y. Yang, A. Galy, J. Zhang, F. Lambert, M. Zhang, F. Zhang, X. Fang

引用次数: 0

Ancient mantle plume components constrained by tungsten isotope variability in arc lavas 弧熔岩中受钨同位素变异性约束的古代地幔柱成分

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2023-06-01 DOI: 10.7185/geochemlet.2321

N. Messling, G. Wörner, M. Willbold

引用次数: 0