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Method for efficiently separating clastic thorium in near-shore coral bones

A technology for corals and skeletons, applied in the field of efficient separation of detrital thorium in near-shore coral skeletons, can solve problems such as large age determination errors, inability to effectively remove coral skeleton organic matter and detrital matter, age errors, etc. Effect

Inactive Publication Date: 2019-07-12
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods cannot effectively remove the organic matter and detritus in coral skeletons, resulting in a high content of detritus Th in the sample, resulting in large age determination errors
Because of this, there are very few reports on the age of young nearshore corals at home and abroad, and the age error in a few reports is also very large (±5-50 years), which cannot meet the needs of scientific research.

Method used

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  • Method for efficiently separating clastic thorium in near-shore coral bones
  • Method for efficiently separating clastic thorium in near-shore coral bones
  • Method for efficiently separating clastic thorium in near-shore coral bones

Examples

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Effect test

Embodiment 1

[0021] A piece of Porites was collected from the coastal coral reef area near Frankland Island in the Great Barrier Reef of Australia at a water depth of 0.5m. The sample was dark yellow, and the detrital thorium content in the sample was preliminarily judged to be high. The sample was divided into three sub-samples: sub-sample GBR-1, sub-sample GBR-2 and sub-sample GBR-3; when the three sub-samples were used for coral dating, the detrital thorium contained in the sample was treated differently, Specifically: sub-sample GBR-1 is untreated, and sub-sample GBR-2 refers to: (1) Thomas, A.L., Fujita, K., Iryu, Y., et al. Assessing subsidence rates and paleo water-depths for Tahiti reefs using U–Th chronology of altered corals[J].MarineGeology,2012,295-298:86-94. and (2) Zhao Jianxin, Yu Keke. Mass spectrum uranium-series dating of reef-building corals in Leizhou Peninsula, South China Sea and Holocene high sea level[ J]. Science Bulletin, 2001, 46(20): 1734-1738. The treatment met...

Embodiment 2

[0037] A piece of branch coral was collected from the coastal coral reef area near the South China Sea at a water depth of 0.5m. The sample was light yellow. The sample was divided into three sub-samples: sub-sample NH-1, sub-sample NH-2 and sub-sample NH-3; three sub-samples In the dating of corals, different treatment methods were adopted for the detrital thorium contained in the samples, specifically: sub-sample NH-1 was not treated, and sub-sample NH-2 referred to: (1) Thomas, A.L., Fujita, K .,Iryu,Y.,et al.Assessing subsidence rates and paleo water-depths for Tahiti reefs using U–Th chronology of altered corals[J].Marine Geology,2012,295-298:86-94. and (2) Zhao Jianxin, Yu Keke.Mass spectrometric uranium-series dating of reef-building corals in Leizhou Peninsula, South China Sea and Holocene high sea level[J]. Science Bulletin, 2001,46(20):1734-1738. The processing methods discussed in these two documents have been cleaned repeatedly and ultrasound, sub-sample NH-3 was p...

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Abstract

The invention discloses a method for efficiently separating clastic thorium in near-shore coral bones, and belongs to the field of coral chronology. The method comprises the following steps of S1, grinding a surface layer substance after a sample to be tested is selected, soaking with hydrogen peroxide, drying, and grinding into powder; S2, soaking the powder in the step S1 into the hydrogen peroxide and then vibrating and cleaning in an ultrasonic oscillator; S3, rinsing the powder in the step S2 by using purified water, adding the purified water after rinsing, and vibrating and cleaning in the ultrasonic oscillator; repeating the step S3 for several times, and drying the powder for future use; and S4, observing the morphology of the powder in the step S3 under a microscope, and selectingthe particles with white color, no mixed color, no impurity and no hole as a to-be-dissolved test sample. The method disclosed by the invention is simple in experimental equipment, convenient to operate and free of isotope fractionation, more than 95% of clastic thorium in the sample can be effectively removed, and the determination of the age precision of the near-shore coral can be remarkably improved.

Description

technical field [0001] The invention relates to the field of coral chronology research, in particular to a method for efficiently separating detritus thorium from offshore coral skeletons. Background technique [0002] Coral reefs are important ecosystems in the ocean. High-precision chronological research on them can reveal the systematic evolution of marine ecosystems, the history of marine storm activity, the history of sea level changes, and understand the impact of human activities on global climate and ecosystems. In the field of coral chronology research, the most widely used and the highest precision is the uranium series dating method, which is based on 238 U- 234 U- 230 Th radioactive decay sequence, by precise determination 230 Th / 238 U and 234 U / 238 The value of U is used to calculate the age of the sample. Accurate determination of radioactive 230 Th content is the key to obtain high-accuracy U-Th age, and the mixing of detrital thorium (non-radioactiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/34G01N27/62
CPCG01N1/34G01N27/62
Inventor 刘恩涛赵建新王华许家省
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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