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        An overview of the volatile systematics of the Lau Basin – Resolving the effects of source variation, magmatic degassing and crustal contamination

        Hahm, Doshik,Hilton, David R.,Castillo, Paterno R.,Hawkins, James W.,Hanan, Barry B.,Hauri, Erik H. Elsevier 2012 Geochimica et cosmochimica acta Vol.85 No.-

        <P><B>Abstract</B></P><P>The Lau Basin erupts lavas with a range of geochemical features reflecting a complex history of interaction involving different mantle sources. The Valu Fa Ridge (VFR) and Mangatolu Triple Junction (MTJ) region have lavas with arc-like characteristics, Niuafo’ou Island (NV), Peggy Ridge and Central and Eastern Lau Spreading Centers (PR, CLSC and ELSC) erupt mid-ocean ridge basalt (MORB)-like volcanics, whereas the Rochambeau Bank (RB) has features akin to ocean island basalt (OIB). To characterize the volatile systematics of these various regions, we report a comprehensive study of 39 submarine lavas from these various eruptive centers encompassing analyses of the noble gases (He, Ne, and Ar) and carbon (CO<SUB>2</SUB>) – both isotopes and abundances – together with other major volatile phases (H<SUB>2</SUB>O, S, Cl, and F).</P><P>Helium isotope ratios of the NV, MTJ, CLSC, and ELSC are MORB-like for the most part except for differentiated lavas that tend to have lower, more radiogenic <SUP>3</SUP>He/<SUP>4</SUP>He values. The RB has considerably higher <SUP>3</SUP>He/<SUP>4</SUP>He ratios (up to 23 <I>R</I><SUB>A</SUB> in this work) which extend as far south as the PR. The influence of ‘plume-like’ sources in the RB is also apparent in Ne isotopes: RB samples follow a trend similar to Hawaiian basalts in 3-isotope neon space. However, RB lavas have lower <SUP>40</SUP>Ar/<SUP>36</SUP>Ar (300–730) and higher [<SUP>36</SUP>Ar] than CLSC and ELSC, suggesting greater air contamination. Elemental He/Ne ratios (<SUP>3</SUP>He/<SUP>22</SUP>Ne<SUB>S</SUB> and <SUP>4</SUP>He/<SUP>21</SUP>Ne<SUP>∗</SUP> where S=solar and *=nucleogenic) are high throughout the Lau Basin and identify the Lau mantle as one of only two high <SUP>3</SUP>He/<SUP>4</SUP>He provinces worldwide with such an enrichment of He relative to Ne.</P><P>Magmatic CO<SUB>2</SUB> and δ<SUP>13</SUP>C fall in the range 7–350ppm and −28‰ to −6‰, respectively. RB lavas have less [CO<SUB>2</SUB>] and slightly lower δ<SUP>13</SUP>C than CLSC and ELSC. The lowest values are found among MTJ lavas. These lavas also have the highest [H<SUB>2</SUB>O], [F], [Cl], and [S] whereas the PR, ELSC and CLSC have the lowest. RB has intermediate [H<SUB>2</SUB>O]. We estimate primary [CO<SUB>2</SUB>] in primary melts using [CO<SUB>2</SUB>]–δ<SUP>13</SUP>C relationships, and find that RB lavas have higher [CO<SUB>2</SUB>] (∼935±168ppm) than ELSC/CLSC (638±115ppm). They also possess higher initial δ<SUP>13</SUP>C values, consistent with observations at other hotspot-related localities. However, there are no discernible differences in primary CO<SUB>2</SUB>/Nb ratios between mantle sources characterized by high <SUP>3</SUP>He/<SUP>4</SUP>He and MORB-like ratios. On the other hand, reconstructed values are considerably higher than that envisaged for depleted MORB mantle based on olivine-hosted melt inclusions.</P>

      • KCI등재

        The Political Economy of Vietnam’s Economic Development: Searching for Nature of the State

        하우리,최동주 한국외국어대학교 동남아연구소 2020 東南亞硏究 Vol.29 No.3

        Vietnam’s reform policy ‘Doimoi’ adopted in 1986 is a historical turning point of the country’s development. From a centrally planned economy, the state has untied the economy and allowed a series of ‘fence-breaking’ changes to transform itself into a socialist-oriented market one. Throughout the reforming process, the Communist Party of Vietnam (CPV) has always played a critical role in creating significant developmental outcomes. Based on Doimoi’s outcomes, there are various approaches aiming to conceptualize Vietnam’s development model such as efforts of flying geese model or developmental state model. However, examining the Vietnamese state under the ‘hard state’ prism is the first time done through this study. The ‘hard state’ approach provides in-depth analyses about the nature of the Vietnamese state which focuses on Vietnamese leadership, the social-political system and insights about various elements of not only economics but also the country’s long course of its social and political development. Findings suggest that the Vietnamese state is characterized as a ‘hard state,’ but also bears the most basic features of a developmental state since Doimoi. This implies that the ‘hard’ nature of the CPV’s leadership has been the key determinant of the successful Doimoi policy. However, a ‘hard state’ merely provides necessary conditions that are required by a developmental state for further rapid growth. Besides that, the geopolitical strategy of the Vietnamese state has always played a critical role in the country’s policy implementation and development process. Therefore, consideration of the nature of the Vietnamese state based on both internal and external perspectives of the hard state and development state model may reflect a better picture over the course of development in Vietnam.

      • KCI등재

        Path Dependence of Vietnam’s Regional Development: Roots from the Colonial Rule

        하우리 서울대학교 아시아연구소 2022 아시아리뷰 Vol.12 No.3

        The Vietnam economy observes stark contrasts in its regional economies, particularly the North-South economic structure. How and from when did these patterns of the North-South regional imbalance appear? This study attempted to trace grounded reasons for this regional divergence from a comparative historical political economy approach, focusing on the French colonial era. The main finding shows a significant dependence of the North-South’s regional development on its past economic structure during the colony, which could be named a socalled path dependence. Differences in colonial policies by region widened the economic discrepancies between the North (Tonkin) and the South (Cochinchina) and provided limited socioeconomic synergy among sectors by region. The limited labour movement and market integration also reinforced regional production patterns. On the one hand, the South promoted specialisation in agriculture, with rice production, industrial crops, trade, and commercial activities, which became the primary sources of its prosperity. In contrast, the northern pattern of diversification of productions essentially sustained the North's autarkic and closed economy. The colonial industry showed a low level of development, especially a lack of linkages between agricultural and industrial production, which left an indelible imprint and legacy on the post-colonial economy. Equally important, the impact of a limited transportation network might have been strong because the freedom to choose a variety of locations was absent, and communications must follow limitedly existing routes.

      • KCI등재

        국내 거주 베트남 유학생의 한국학 교육 경험과 문화적응의 관계

        박미화,하우리,김솔 한국국제문화교류학회 2022 문화교류와 다문화교육 Vol.11 No.3

        본 연구는 국내 거주 베트남 유학생을 대상으로 하여 한국학 교육 경험과 문화적응유형에 대해 분석하였다. 국내 거주 베트남 유학생 278명을 대상으로 실시한 설문조사를 통해 도출한 결과는 다음과 같다. 첫째, 국내 거주 베트남 유학생은 거주기간, 한국어 능력(TOPIK)에 따라 상이한 문화적응 양상을 보였다. 유학생의 거주기간이 짧을수록 분리와 주변화 전략이 나타났고, 한국어 소통이 원활할수록 동화와 통합 전략이 나타났다. 둘째, 베트남 유학생이 한국에 입국 전과 후에 받는 한국학 교육 경험 유무와기간에 따라 문화적응 전략에 차이를 보였다. 특히 입국 전 받는 한국학 교육이 문화적응에 중요한 영향을 미치고 있었다. 셋째, 한국에 입국 전 받는 한국학 교육은 베트남유학생의 주변화 전략에 영향을 미치고 있었고, 입국 후 받는 한국학 교육 기간이 길어질수록 주변화 전략이 나타났다. 넷째, 베트남 유학생은 하나의 문화적응 전략을 보이지 않고, 개개인이 처한 환경과 시기에 따라 다양한 문화적응 전략을 보이고 있었다.

      • KCI등재

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