KẾT QUẢ BƯỚC ĐẦU NGHIÊN CỨU TỐC ĐỘ LẮNG ĐỌNG,  NGUỒN TRẦM TÍCH ĐÁY VỊNH HẠ LONG: DẤU HIỆU  TỪ KHOÁNG VẬT SÉT, ĐỒNG VỊ 210Pb VÀ 137Cs

Bui Van Vuong; Zhifei Liu; Tran Duc Thanh; Chih-An Huh; Dang Hoai Nhon; Nguyen Dac Ve; Dinh Van Huy

doi:10.15625/1859-3097/16/1/6527

Author affiliations

Authors

Bui Van Vuong Institute of Marine Environment and Resources-VAST
Zhifei Liu State Key Laboratory of Marine Geology, Tongji University, Shanghai, China
Tran Duc Thanh Institute of Marine Environment and Resources-VAST
Chih-An Huh Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
Dang Hoai Nhon Institute of Marine Environment and Resources-VAST
Nguyen Dac Ve Institute of Marine Environment and Resources-VAST
Dinh Van Huy Institute of Marine Environment and Resources-VAST

DOI:

https://doi.org/10.15625/1859-3097/16/1/6527

Keywords:

Ha Long bay, clay mineralogy, the 210Pb and 137Cs radionuclides datings, sedimentation rates.

Abstract

Ha Long bay is the World Natural Heritage, which annaually attracts a lot of foreign and domestic tourists. Nevertheless, in recent years, the landscape of Ha Long bay is devastated by many negative impacts-the shallowing of the bottom of bay is one of the great negative impacts. How is the shallowing of the bottom of Ha Long bay? What are reasons for the negative impacts? Based on the approach “source-to-sink” combined with results of clay mineral contents, results of ²¹⁰Pb and ¹³⁷Cs radionuclides, this study will contribute to clarifying the shallowing of the bottom of Ha Long bay. Results of smectite, illite and smectite/(illite+chlorite) ratios indicated that the sediment in Ha Long bay not only derives from the surrounding region of Ha Long bay but also derives from Red river system. Results of ²¹⁰Pb_ex and ¹³⁷Cs_ex revealed the sedimentation rates in the Ha Long bay have varied between 0.47 - 0.75 cm/year over the last 100 years. It can be divided into four periods: period I (1920 - 1930); period II (1930 - 1960); period III (1960 - 1990); and period IV (1990 - 2011) with the average rate of 0.45 cm/year; 0.66 cm/year; 0.50 cm/year; and 0.85 cm/year respectively. The shallowing of the bottom of Ha Long bay was impacted by human activities such as building reservoirs, mining, urbanization or aquaculture etc.

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