Crystals of suspended marine barite in the eastern equatorial Pacific: processes of dissolution and effects on crystal morphology -- Journal of Oceanology and Limnology,2015,33(1):194-203

	Cite this paper:
	SUN Xiaoxia, YANG Zuosheng, FAN Dejiang, LI Yunhai. Crystals of suspended marine barite in the eastern equatorial Pacific: processes of dissolution and effects on crystal morphology[J]. Journal of Oceanology and Limnology, 2015, 33(1): 194-203

Crystals of suspended marine barite in the eastern equatorial Pacific: processes of dissolution and effects on crystal morphology

SUN Xiaoxia^1,2, YANG Zuosheng^1,2, FAN Dejiang^1,2, LI Yunhai³

1 College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;
2 Key Laboratory of Submarine Geosciences and Prospecting Technology, Ministry of Education, Qingdao 266100, China;
3 Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

Abstract:

Suspended particulate substances were sampled in the eastern equatorial Pacific in water column from surface to near bottom in five stations in 2005, from which 868 barite crystals were recovered. The barite crystals were examined under scanning electron microscopy. About 61% of the total barites crystals contained detectable Sr by energy dispersive X-ray spectrometry. Barite crystals could be classified into four groups based on their morphology: 1) bladed; 2) ovoid or rounded; 3) arrow-like; and 4) irregularly shaped. The arrow-like barite crystals in natural environment has never been reported before. In addition, about a half of the studied crystals showed features of dissolution as cavities or holes inside of the crystals or around their edges. We found that differential dissolution of barite crystals is consequence of heterogeneous Sr distribution in barite crystals. Our results would help in understanding the biogeochemical processes of marine barite formation and preservation in seawater and marine sediments.

Key words: marine barite|crystal morphology|Equatorial Pacific|preferential dissolution|Sr substitution in marine barite

Received: 2014-01-11 Revised: 2014-06-04

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Articles by YANG Zuosheng

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