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Correction to "Origin of magnetic mineral concentration variation in the Southern Ocean" Authors: Toshitsugu Yamazaki Atomsphere and Ocean Research Institute, The University of Tokyo …
For the studied sediments, magnetic components are mainly identified as biogenic magnetite and detrital magnetic minerals (dust and volcanic origins) based on coercivity analysis, microscopic observations, and sedimentological information.
Paleomagnetism is a commonly used and effective method for achieving this goal in marine sediments (e.g., Channell et al., 2013; Liu et al., 2014 ), including in the SCS. For example, Wang et al. (1993) reported that sedimentation rates decreased as water-depth deepened based on paleomagnetic analysis of three cores near the Nansha Islands.
A 7.54-m-long sediment core (SK 200/22a) was collected from the Indian Ocean sector of the Southern Ocean at 43°42′S/45°04′E from a water depth of 2,730 m onboard ORV Sagar Kanya (Fig. 1 ). The core was sampled onboard at 1 cm intervals for the first 200 cm and at 2 cm intervals below this.
Biogenic magnetic minerals (i.e., magnetite or greigite magnetosomes) have widespread occurrence in natural environments and make significant contributions to the paleomagnetic and...
In the Southern Ocean, magnetic mineral concentration increases in glacial periods. The variation pattern closely resembles eolian dust flux records from …
Many rock magnetic studies around Asia and the Pacific Ocean successfully documented paleoclimatic and monsoonal changes in marine sediments by recognizing characteristic magnetic signatures in response to climatic variations (e.g. Yamazaki and Ioka, 1997, Kissel et al., 2003, Yamazaki, 2009 ).
The objective of this study was to characterize variations in magnetic properties from a sediment core retrieved from an estuarine system in the Yeongsan Estuary on the west coast of South Korea and to identify diagenetic effects that can cause down-core variation of magnetic properties.
Here we show that a high-resolution record of South Atlantic Ocean bottom water oxygenation can be extracted from exceptionally preserved magnetofossils—the bioinorganic magnetite nanocrystals...
These observations suggest that the increased magnetic concentration in glacials in the Southern Ocean may be explained by iron fertilization; the production of …
Magnetic minerals of detrital origin mainly enter lakes via fluvial and aeolian transport (Zhang et al. 1995 ). Although the coercivity distributions of detrital magnetic particles transported through water systems (D) and eolian dust (ED) overlap, their χ ARM /SIRM values are quite different (Egli 2004a, b, c ).
Magnetic minerals are derived from submarine volcanism, and the magnetic susceptibility is high in the layer containing volcanic material.
Magnetic declination or variation is the angle on the horizontal plane between magnetic north (the direction the north end of a compass needle points, corresponding to the direction of the Earth's magnetic field lines) and true north (the direction along a meridian towards the geographic North Pole) What is a magnetic inclination?
The primary origin of magnetic minerals in lake sediments is via the input of terrigenous iron oxides supplied by fluvial and eolian transport (Thompson and Morton, 1979, Evans et al., 1997, Wang et al., 2004, An et al., 2012, Oldfield, 2013, Roberts, 2015, Hu et al., 2015).
Read "Correction to "Origin of magnetic mineral concentration variation in the Southern Ocean", Paleoceanography and Paleoclimatology" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. ... In the paper "Origin of magnetic mineral concentration ...
SD/PSD detrital magnetite/titanomagnetite are the main magnetic minerals within surface sediments in the studied area, with large variations in magnetic concentration and grain size. 2) FCM cluster analysis of multiple magnetic parameters indicates clear spatial distributions: magnetic concentration and grain size both …
These observations suggest that the increased magnetic concentration in glacials in the Southern Ocean may be explained by iron fertilization; the production of biogenic …
Mejia et al. ( 2004) reported results on the basaltic lava areas of southern Patagonia. Paleomagnetic directions were obtained from alternating-field or thermal demagnetization of 53 lava flows from the Pali-Aike volcanic field and the Meseta Vizcachas plateau lavas (Fig. 1 ).
In the Southern Ocean as well as in the Atlantic, it is known that magnetic mineral concentration, represented by rock-magnetic parameters such as magnetic …
From the Godavari river mouth to the inner Bay of Bengal, magnetic concentration gradually decreases with a fining trend of magnetic grain size. Clusters 1B, 2, and 3 are on the east side of the 'active valley', where magnetic concentration and magnetic grain size decrease with increasing distance to the 'active valley'.
Numerous origins have been proposed for the vein-dykes including as skarns, anatexis of marble/calc–silicate country rock, carbonatites, and silicocarbonate melts of crustal or mantle origin, and are summarized in Joyce [ 4 ]. Figure 1. Simplified geologic map of the Adirondack Region.
1 in the southern ocean, magnetic mineral concentration increases in glacial periods. the variation pattern closely resembles eolian dust flux records from antarctic ice cores, …
increased magnetic concentration in glacials in the Southern Ocean may be explained by iron fertilization; the production of biogenic magnetites was enhanced associated with …
The minor increase in susceptibility at ~ 250 °C with peak around ~ 290–300 °C indicated the transformation of weakly magnetic minerals such as ferrihydrite to relatively stronger magnetic minerals such as maghemite (Hanesch et al. 2006 ).
Correction to "Origin of magnetic mineral concentration variation in the Southern Ocean" Toshitsugu Yamazaki and Minoru Ikehara Received 3 July 2012; published 25 August 2012. Citation: Yamazaki, T., and M. Ikehara (2012), Correction to "Origin of magnetic mineral concentration variation in the Southern Ocean," …
The southern four sites (NB68, NG69, NB70, and NMC2) are exceptions, where the mean coercivity is a little lower, about 35 mT. The mean and dispersion of the M component are between 98 and 105 mT and between 0.26 and 0.30, respectively.
Variations in the extent of glaciated areas are among the most distinct natural responses to climate change. To explore the response mechanism of sediment magnetic properties to glacial-area variation, detailed environmental magnetism investigations were performed on a sediment core from Lake Heihai, an alpine lake …
The first group (P560 nm) is the coarsegrained hematite of lithogenic origin and is mostly confined to western China. The P535 nm group is of pedogenic origin. The P545 nm group is an...
Southern Ocean; biogenic magnetite; environmental magnetism; eolian dust; iron fertilization; Geomagnetism and Paleomagnetism: Biogenic magnetic minerals; …
The increased magnetic mineral concentration in glacial periods in the Southern Ocean may be explained by iron fertilization; …
Yamazaki, T. and Ikehara, M. (2012) Origin of Magnetic Mineral Concentration Variation in the Southern Ocean. Paleoceanography, 27, 1-13.
Originally used simply to distinguish between a deposit that was emplaced above or below the Curie temperature of its principal magnetic minerals (Aramaki and Akimoto 1957 ), a more detailed technique now uses the analysis of paleomagnetic vector components to isolate different parts of the deposit's cooling history.
In the Southern Ocean, magnetic mineral concentration increases in glacial periods. The variation pattern closely resembles eolian dust flux records from Antarctic ice cores, but the cause of the linkage remains unclear, as the dust flux is too small for the source of terrigenous materials in the Southern Ocean.
In the Southern Ocean, magnetic mineral concentration increases in glacial periods. The variation pattern closely resembles eolian dust flux records from Antarctic ice cores, but the cause of the linkage remains unclear, as the dust flux is too small for the source of terrigenous materials in the Southern Ocean.
Correction to "Origin of magnetic mineral concentration variation in the Southern Ocean" ... Paleoceanography. Pub Date: September 2012 DOI: 10.1029/2012PA002373 Bibcode: 2012PalOc..27.3220Y Keywords: Southern Ocean; ... Geomagnetism and Paleomagnetism: Biogenic magnetic minerals; Geomagnetism and Paleomagnetism: …
Fe-bearing minerals are a tiny fraction of the composition of speleothems. They have their origin in the karst system or are transported from the drainage basin into the cave. Recent studies on the magnetism of speleothems focused on the variations of their magnetic mineralogy in specific time intervals and are usually limited to a single …
Sea level fluctuation caused by global climate change was the main factor for variation in concentration of magnetic minerals and magnetic particle size of the studied core sediments. Thus, variation of sediment magnetic properties in the study area can be used as an indirect indicator of sea level fluctuation. 1 Introduction