Activators of photoluminescence in calcite: evidence from high-resolution, laser-excited luminescence spectroscopy

V.A. Pedone; K.R. Cercone; R.C. Burruss

doi:10.1016/0009-2541(90)90112-k

Home/Archive/USGS

USGS · 70016049

Activators of photoluminescence in calcite: evidence from high-resolution, laser-excited luminescence spectroscopy

V.A. Pedone·K.R. Cercone·R.C. Burruss

View original source ↗Export metadata ↓

Abstract

Laser-excited luminescence spectroscopy of a red-algal, biogenic calcite and a synthetic Mn-calcite can make the distinction between organic and trace-element activators of photoluminescence. Organic-activated photoluminescence in biogenic calcite is characterized by significant peak shifts and increasing intensity with shorter-wavelength excitation and by significant decreases in intensity after heating to ??? 400??C. In contrast, Mn-activated photoluminescence shows no peak shift, greatest intensity under green excitation and limited changes after heating. Examination of samples with a high-sensitivity spectrometer using several wavelengths of exciting light is necessary for identification of photoluminescence activators. ?? 1990.

Explore related subjects

Chemical Geology Article

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

V.A. Pedone, K.R. Cercone, R.C. Burruss. 1990. Activators of photoluminescence in calcite: evidence from high-resolution, laser-excited luminescence spectroscopy. https://doi.org/10.1016/0009-2541(90)90112-k

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related USGS reports

USGS2026

Trace element heterogeneity and crystallization history of the Plesovice zircon: Implications for its use as a U–Pb LA-ICP-MS reference material

Zircon crystals from Plešovice hyperpotassic granulite (HPG) have been widely used as a reference material for LA-ICP-MS dating. Detailed cathodoluminescence (CL) imaging and trace element analysis reveal a complex internal structure of Plešovice zircon linked to extreme chemical heterogeneity, which allows us to distinguish different zircon domains formed during its crystallization: (i) rare low-CL cores enriched in U, Nb, HREE and Y; (ii) dominant sector-zoned to oscillatory-zoned domains, and (iii) CL-bright rims poor in trace elements. Relic fine oscillatory zoned areas are chemically homogeneous, whereas coarsened and blurred areas, and CL-dark replacement domains, are heterogeneous. Based on these data we suggest a complex and protracted zircon evolution: (i) crystallization of metamorphic zircon in anatectic calc-alkaline granulite; (ii) magmatic zircon crystallization at high temperature and pressure in a dry ultrapotassic melt at presence of peritectic garnet; (iii) coupled zircon dissolution-precipitation processes triggered by percolating hydrous residual melt; and (iv) coarsening and replacement of the pre-existing zircon due to prolonged exposure to a reactive fluid/hydrous melt. New CA-ID-TIMS U Pb dates between 337.167 ± 0.080 and 337.840 ± 0.080 Ma confirm crystallization age for HPG zircon at around 337.4 Ma and suggest that previously published dates of 336.37 Ma were biased by non-mitigated lead loss. We thus confirm the U/Pb homogeneity of Plešovice reference zircon despite its chemical heterogeneity. We further discuss the implications of using the chemically extremely heterogeneous Plešovice reference zircon as primary or secondary standard for in-situ LA-ICP-MS geochronology, in particular for quantification of the chemical matrix-dependence of the relative sensitivity factor ( β ) of laser ablation.

Plešovice quarry↗

USGS2026

Osmium isotope constraints on Mauna Loa–Kilauea magmatic connectivity, Island of Hawai‘i

The Hawaiian volcanic chain exhibits a long-recognized double track of volcanism defined by the Loa and Kea trends, which erupt chemically and isotopically distinct lavas. Mauna Loa and Kīlauea, the two most frequently active volcanoes of the Loa and Kea trends, produce distinct endmember compositions. However, historical periods of compositional convergence have prompted debate regarding a potential magmatic connection between the two adjacent volcanoes. Proposed links include a shallow edifice-level plumbing system, a common magma source at ∼40 km depth, or a deeper asthenospheric source. In the latter scenario, based on correlated Sr–Nd–Pb isotopes and trace-element systematics, a “shared” mantle source supplies melt alternately to both volcanoes on multi-decadal timescales. Here, we use Os isotopes to evaluate the proposed connections. We measured Os isotopes in eight historical Mauna Loa tholeiites along with three Kīlauea tholeiites (1832 summit eruption; Uēkahuna Bluff; 2000 Pu‘u‘ō‘ō eruption) previously identified as isotopically intermediate between Mauna Loa and Kīlauea endmembers. We found that the acidic bromide leachates of all samples yield more radiogenic 187 Os/ 188 Os than corresponding bulk residues, with the labile Os-bearing phase comprising ∼0.4–27% of bulk Os. Mauna Loa tholeiites display nearly constant 187 Os/ 188 Os over the past ∼200 years (0.134–0.136; mean = 0.1357 ± 0.0013, n = 8, 2SD), despite large variations in total [Os] ranging from ∼30 pg/g (2022 tholeiite) to ∼966 pg/g (1868 picrite). The Kīlauea 1832 sample has 187 Os/ 188 Os = 0.1302 ± 0.0008, slightly higher than the Kīlauea endmember (0.1285 ± 0.0008), whereas the Uēkahuna Bluff and Pu‘u‘ō‘ō samples exhibit more elevated ratios (0.1314 ± 0.0008 and 0.1327 ± 0.0008, respectively). We conclude that the “shared” mantle source exerts negligible control on Mauna Loa Os isotope systematics. In contrast, the Kīlauea mantle source is more heterogeneous, with contributions from small-scale recycled domains with variable time-integrated Re/Os ratios.

Hawaii↗

USGS2026

The Sedimentary Geochemistry and Paleoenvironments Project Phase 2 data release: An open data resource for the study of Earth's environmental history

Geochemical data from sedimentary rocks are the primary source of information regarding Earth's surface evolution through time, including its air and water envelopes and interactions with life and deep Earth processes. The Sedimentary Geochemistry and Paleoenvironments Project (SGP) is a scientific consortium centered around open data and community-driven development of cyberinfrastructure tools and resources for sedimentary geochemistry and Earth history. Here we describe the SGP Phase 2 data release, which focused on incorporating Paleoproterozoic and Mesoproterozoic (2500–1000 million years ago) data and better accommodating carbonate data. This data release was built through the involvement of >200 researchers worldwide in academia, government, and industry, and provides the largest available public data resource for our user community in the academic fields of geochemistry, sedimentology, tectonics, paleontology, Earth history, and paleoclimate, as well as the petroleum and minerals industries. The dataset now encompasses 126,006 samples and 4,132,371 geochemical analyses. In addition to direct entry by SGP Team Members, we have ingested and incorporated datasets from the Geoscience Australia OZCHEM database, the Alberta Geological Survey, and the Deep-Time Marine Sedimentary Element Database (DM-SED) compilation. This paper details sampling in the Phase 2 dataset with respect to age, geography, lithology, and other geological characteristics, documents access via our search website and API, discusses possible issues and/or biases in the dataset that could impact analyses, describes plans for governance and stewardship of data from Indigenous lands, and serves as the citable reference paper for the data release.

Chemical Geology↗