scholarly journals Phytoplankton contributions to the trace-element composition of Precambrian banded iron formations

2017 ◽  
Vol 130 (5-6) ◽  
pp. 941-951 ◽  
Author(s):  
Kurt O. Konhauser ◽  
Leslie J. Robbins ◽  
Daniel S. Alessi ◽  
Shannon L. Flynn ◽  
Murray K. Gingras ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Composition ◽  
Element Composition ◽  
Banded Iron Formations ◽  
Iron Formations

Zinc and Nickel signature for abiogenic and biogenic magnetite: implications for the origin of magnetite in banded iron formations

2020 ◽  
Author(s):  
Xiaohua Han ◽  
Elizabeth Tomaszewski ◽  
Ronny Schönberg ◽  
Yongxin Pan ◽  
James Byrne ◽  
...  
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Shewanella Oneidensis ◽  
Transformation Products ◽  
Trace Element Composition ◽  
Trace Element Distribution ◽  
Banded Iron Formations ◽  
Hepes Buffer ◽  
Biogenic Magnetite ◽  
Iron Formations

<p>There are longstanding and ongoing controversies about the abiogenic or biogenic origin of magnetite in banded iron formations (BIFs). The trace element composition of magnetite was proposed as a promising tracer for distinguishing biogenic from abiogenic magnetite, which, however, remains to be explored quantitatively. Here, we compared the partitioning of trace elements Zinc (Zn) and Nickel (Ni) in both abiogenic and biogenic magnetite produced either by an abiotic reaction of ferrihydrite with by Fe<sup>2+</sup><sub>aq</sub> or by Fe(III)-reducing bacteria <em>Shewanella oneidensis</em> MR-1. We compared the transformation of three different ferrihydrite (Fh) starting materials: 1) Control Fh without added trace elements, 2) ferrihydrite with co-precipitated Zn (ZnFh) and 3) ferrihydrite with co-precipitated Ni (NiFh) – both in either NaHCO<sub>3</sub> or HEPES buffer. We monitored Fe concentration and speciation in both aqueous and solid phases over time using the spectrophotometric ferrozine assay, analyzed Fh transformation products by Mössbauer spectroscopy as well as X-ray diffraction and quantified Zn and Ni in solution and in the minerals by iCAP-Qc quadrupole mass spectrometer after acidic dissolution of the minerals. In summary our results revealed that both Zn and Ni are much more depleted in abiogenic magnetite than those in biogenic magnetite, independent of whether magnetite was precipitated in NaHCO<sub>3</sub> or HEPES buffer. Although further analyses are needed, this suggests that the trace element distribution could be a chemical signature to distinguish biogenic from abiogenic magnetite in BIFs.</p>

CHANGES IN TRACE ELEMENT COMPOSITION BETWEEN FLOAT BASALTS AND THE SEDIMENTS OF YELLOWKNIFE BAY, GALE CRATER, MARS

2017 ◽  
Author(s):  
Ryan S. Jackson ◽  
◽  
Horton Newsom ◽  
Agnes Cousin ◽  
Valérie Payre ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Composition ◽  
Element Composition ◽  
Gale Crater

Trace Element Composition of Silicate Minerals in the Chondrules and Matrix of the Buschhof Meteorite

2020 ◽  
Vol 58 (12) ◽  
pp. 1321-1330
Author(s):  
K. G. Sukhanova ◽  
S. G. Skublov ◽  
O. L. Galankina ◽  
E. V. Obolonskaya ◽  
E. L. Kotova
Keyword(s):  
Trace Element ◽  
Trace Element Composition ◽  
Element Composition ◽  
Silicate Minerals

Mineral and trace element composition after digestion and leaching into matcha ice tea infusions (Camellia sinensis L.)

2021 ◽  
pp. 103792
Author(s):  
Tereza Koláčková ◽  
Daniela Sumczynski ◽  
Vratislav Bednařík ◽  
Štěpán Vinter ◽  
Jana Orsavová ◽  
...  
Keyword(s):  
Trace Element ◽  
Camellia Sinensis ◽  
Trace Element Composition ◽  
Element Composition ◽  
Tea Infusions

Trace element composition of tree fodder and potential nutritional use for livestock

2021 ◽  
pp. 104560
Author(s):  
N.R. Kendall ◽  
J. Smith ◽  
L.K. Whistance ◽  
S. Stergiadis ◽  
C Stoate ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Composition ◽  
Element Composition ◽  
Tree Fodder
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