Table of Content

31 December 2003, Volume 25 Issue s1

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Brief Report

THE SECTION OF AIRFALL CLASTIC ROCK OF HOLOCENE VOLCANO IN JINGPOHU REGION AND ITS ERUPTIVE HISTORY

FAN Qi-Cheng, SUN Qian, LI Ni, YIN Jin-Hui, CHEN Hong-Zhou, GAO Feng, ZHANG Ti-Jie

2003, 25(s1):  3-11.  DOI: ISSN:0253-4967.0.2003-S1-001

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More than ten volcanoes of Jingpohu Holocene Volcanic Group consist of five small eruption centers situated at southwest area and northeast area separately. Southwest area includes four eruption centers, namely “Crater Forest”, “Daganpao”, “Wudaogou” and “Mihunzhen”, respectively. Northeast area has only one eruption center called “Hamatang”. Eruptive materials include mainly lava flow, splash deposit and airfall deposit. Volcanic cone consists of cinder, bomb, driblet and thin lava flow. The thickness of a

DIVISION OF THE ACTIVE PERIOD OF QUATERNARY VOLCANISM IN MAANLING, NORTHERN HAINAN PROVINCE

BAI Zhi-Da, XU De-Bin, WEI Hai-Quan, HU Jiu-Chang

2003, 25(s1):  12-20.  DOI: ISSN:0253-4967.0.2003-S1-002

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The Quaternary volcanism in Ma anling area, northern Hainan Province is characterized by multi-periodic activity. Based on several factors, such as the active manner of the volcano, volcanic morphology, weathering degree, volcanic eruptive cumulus deposition, sedimentary stratigraphy, mutual superimposition relation between the volcanic apparatus, and isotope age, the Quaternary volcanic activity in Ma anling area can be divided into Deyiling stage of mid-Pleistocene age, Daotang and Yanghua stages of late

NOMENCLATURE OF THE HOLOCENE VOLCANIC SYSTEMS AND RESEARCH ON THE TEXTURAL PARAMETERS OF THE SCORIA CONES IN NORTHERN HAINAN ISLAND

WEI Hai-Quan, BAI Zhi-Da, HU Jiu-Chang, SHI Lan-Bin, ZHANG Bing-Liang, XU De-Bin, SUN Qian, FAN Qi-Cheng

2003, 25(s1):  21-32.  DOI: ISSN:0253-4967.0.2003-S1-003

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The Holocene volcanoes in the northern Hainan Island can be divided into 4 systems. These 4 systems include Maanling plateau volcanic system in the northwest part, Leihuling shield volcanic system in the southeast, Haochang monogenic volcanic system in between, and the NW-trending fissure eruption system. The Maanling plateau volcanoes consist of 4 cones and the related lava flows that flow to the northwest, southwest, and northeast, respectively. The Leihuling volcanoes are composed also of cones and lava

DISCOVERY OF MANTLE-DERIVED MICRO-XENOLITHS FROM QUATERNARY BASALTS IN NORTHERN HAINAN ISLAND AND ITS GEOLOGICAL IMPLICATION

SHI Lan-Bin, LIN Chuan-Yong, CHEN Xiao-De, ZHANG Bing-Liang

2003, 25(s1):  33-42.  DOI: ISSN:0253-4967.0.2003-S1-004

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Mantle-derived xenoliths of various sizes are abundant in Tertiary basalts of Northern Hainan Island, but no mantle xenolith has been found in Quaternary basalts of this region. Microstructural observation on 140 thin sections cut from Quaternary basalt samples reveals that the naturally oxidized large olivine grains exhibit well-developed dislocation sub-structures. In addition, the polycrystalline micro-fragments consisting of olivine and pyroxene grains are characterized by textures typical of mantle xen

GEOCHEMICAL CHARACTERISTICS OF SUBSURFACE FLUIDS AND VOLCANIC HAZARD ASSESSMENT IN NORTHERN HAINAN VOLCANIC REGION

SHANG Guan-Zhi-Guan, GAO Qing-Wu, LIU Wei, HU Jiu-Chang

2003, 25(s1):  43-50.  DOI: ISSN:0253-4967.0.2003-S1-005

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The results of detailed investigation on the chemical and isotopic compositions of subsurface fluids in Northern Hainan Quaternary volcanic region indicate that the Maanling and Leihuling volcanoes would be the dormant volcanoes, and great attention should be continuously paid to them. Near the Maanling crater the sodium content of underground water is anomalously higher, and also the releasing activity of deep-seated CO 2 is visible. Moreover, the determined results of hydrogen and oxygen isotopic compo

CENOZOIC VOLCANISM AND TECTONIC EVOLUTION IN THE TIBETAN PLATEAU AND ITS ADJACENT AREAS

DENG Mo-Meng

2003, 25(s1):  51-61.  DOI: ISSN:0253-4967.0.2003-S1-006

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Tibetan Plateau is an important area with distinctive features in China, and has long been an attractive place for the investigation of geodynamics and geological evolution. The Mesozoic-Cenozoic volcanic activities in this region were controlled by deep geophysic-chemical reactions, and were the manifestation and result of the interaction of multiple factors. In this area, there are both potassic (dominant) and sodic volcanic rocks (secondary); and there are also eruptive lavas (dominant), and some subvolc

STUDY ON THE HELIUM ISOTOPIC COMPOSITIONS OF XIGAZE OPHIOLITES, TIBET

XIE Xian-Ren, TUN Mao-Bing, DAO Meng-Shen, ZHANG Ming-Jie

2003, 25(s1):  62-70.  DOI: ISSN:0253-4967.0.2003-S1-007

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We have investigated the Xigaze ophiolites (Tibet) in the Yarlung Zangbo ophiolite belt (Tibet), SW China, by using noble gases isotopic compositions. The rocks investigated in this paper include serpentinized peridotites, basalts and dolerites. The 3He/ ? 4He ratios in these basalts are similar, having an average value of 5.36R a, and the He contents closely resemble each other. Two exceptions are basalt samples from Dagzhuka, with 3He/ ? 4He ratios that are lower than atmospheric value

GEOLOGICAL CHARACTERISTICS AND SIGNIFICANCE OF VOLCANIC ROCKS AT THE BOTTOM OF THE MIDDLE TRIASSIC MANGHUAI FORMATION IN YAKOU REGION, SIMAO CITY, YUNNAN PROVINCE

DENG Jiang-Gong, XIAO Yuan-Fu, HUANG Run-Qiu, HU Mo, YAN Meng

2003, 25(s1):  71-77.  DOI: ISSN:0253-4967.0.2003-S1-008

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The layer at the bottom of the middle Triassic Manghuai Formation in the western Yunnan, has long been considered as normal sandy gravel of basal conglomerate characteristics. However, recent field investigation and comparative study in Yakou region have discovered that this layer is in fact composed of a series of pyroclastic rocks. This layer can be assigned to a series of collision type K-rich dacite—kaliliparite and lava, which contain angular granitic agglomerates and rubbles of different sizes. The ch

PORPHYRY COPPER DEPOSITS AND CONTINENTAL VOLCANISM

RUI Zong-Yao, ZHANG Li-Sheng, WANG Long-Sheng, WANG Xi-Tian

2003, 25(s1):  78-87.  DOI: ISSN:0253-4967.0.2003-S1-009

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Porphyry copper deposits are the result of the evolution of granitic magmatism-hydrothermal system (including volcanism) in island arc and on active continent margin, and occur mainly on the upper side of convergent plates. On the basis of the relationship of porphyry copper deposits with penecontemporaneous continental volcanic rocks, porphyry copper deposits may be divided into 2 types: 1) porphyry copper deposits associated with pre-ore or syn-ore continental volcanic rocks, such as the Yinshan deposit i

ENVIRONMENTAL AND CLIMATIC EFFECTS OF VOLCANIC VOLATILES AND THE USE OF VOLATILES AS POTENTIAL INDICATOR OF FUTURE ERUPTIONS

GUO Zheng-Fu, LIU Jia-Qi, HE Fu-Yu, DUO Chu-Zhen, SUN Hui-Guo, DAI Guo-Liang, CHEN He-Hai

2003, 25(s1):  88-98.  DOI: ISSN:0253-4967.0.2003-S1-010

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This paper reviews the environmental and climatic effects of volcanic volatiles of various compositions, and discusses the volcanic hazard induced by volatile emission. It focuses on the following four topics: (1) analytical methods of compositions and contents of emitted volatiles; (2) mass estimation of volatile emission and aerosols; (3) combined studies of physical volcanology and composition of released volatiles; (4) the effects of volatiles emitted from intermediate-acidic volcanic eruption on env

DYNAMIC OBSERVATION AND MONITORING OF CRUSTAL DEFORMATION AND GEOTHERMAL FLOW IN THE VOLCANO AND GEODYNAMICS LABORATORY OF LANZAROTE

CA Wei-Xin, Vieira R, TAN Kuo-Ling, Arnoso J, SHEN Chong-Yang, Velez E J

2003, 25(s1):  99-108.  DOI: ISSN:0253-4967.0.2003-S1-011

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This paper introduces the observation and investigation results of the cooperation between China and Spain in the Volcano and Geodynamics Laboratory of Lanzarote in the past 12 years. Since 1991, China and Spain have built together two observation stations at Cueva and Timanfaga in the volcanic active region of Lanzarote Island, and carried out the dynamic monitoring and observation of crustal deformation and geothermal flow. The long period stability of 29 sets observation instruments developed cooperative

PRELIMINARY STUDY ON THE ACTIVE STATE OF CHANGBAISHAN TIANCHI VOLCANO

ZHANG Heng-Rong, LIU Guo-Meng, WU Cheng-Zhi, KONG Qiang-Jun, GUO Feng

2003, 25(s1):  109-120.  DOI: ISSN:0253-4967.0.2003-S1-012

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This paper presents the detailed analysis of various kinds of continuous observation data, including seismic records, deformation measurements (GPS and leveling measurements), and hydrochemical survey of groundwater obtained by the Changbaishan Tianchi volcano observatory in the past 4 years. At the same time, the comparative analyses between the obtained data with those obtained before have been carried out. Based on these data, the present state of the activity of Changbaishan Tianchi volcano is estimated

OBSERVATION AND RESEARCH ON HOT AND WARM SPRINGS IN CHANGBAISHAN TIANCHI VOLCANO

JIN Dong-Chun, CUI Tian-Ri, JIN Mei-Lan

2003, 25(s1):  121-127.  DOI: ISSN:0253-4967.0.2003-S1-013

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The Observation and research on hot and warm spring of volcano are of great significance to monitoring the activity of dormant volcanoes and to the evaluation and prediction of the potential risk of volcanic eruption. Since 1985, detailed reconnaissance, observation, and research on the hot and warm springs in Changbaishan Tianchi volcano have been carried out by the Seismological Bureau of Yanbian Prefecture. The results of observation and research show that the temperature and gas content of the hot and

CHARACTERISTICS OF EARTHQUAKE CLUSTER ACTIVITY IN TENGCHONG VOLCANIC AREA

XIE Jian-Qiang, CA Chao-Beng, LIU Hua-Jun, WANG Chao-Jin, CA Meng-Jun

2003, 25(s1):  128-137.  DOI: ISSN:0253-4967.0.2003-S1-014

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Thirty seismic events related to magmatic activities have been selected from observation data of the mobile digital seismic network disposed in Tengchong volcanic area in 1998, 1999 and 2002. These selected events mainly occurred in cluster. The relations between the activities of volcanic earthquake clusters and the locations of magma chambers are analyzed on the basis of space-time-magnitude distributions of earthquake clusters, seismic wave characteristics, focal parameters and focal mechanisms. The an

OBSERVATION OF MICROEARTHQUAKES IN TENCHONG VOLCANIC AREA IN 2002

CA Chao-Beng, LIU Hua-Jun, XIE Jian-Qiang, CA Meng-Jun

2003, 25(s1):  138-146.  DOI: ISSN:0253-4967.0.2003-S1-015

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This paper introduces the results of micro-earthquake observation by digital mobile seismic observation network disposed in Tengchong volcanic area during the period from June 6 to September 13, 2002. During the observation, 292 seismic events occurred in Tengchong and its peripheral areas had been recorded. The analysis of the obtained data shows that the volcanic earthquake activity in the southern part of Tencgchong volcanic area is still very frequent, appearing mainly as micro-earthquake. Based on th