CHARACTERISTICS OF AUTHIGENIC CARBONATES FROM A MEGA-POCKMARK ON THE EASTERN SIDE OF BAIYUN SAG,SOUTH CHINA SEA AND THEIR GEOLOGICAL SIGNIFICANCE

LIU Xingjian; TANG Dehao; YAN Pin; GE Chendong; WANG Yanlin

doi:10.16562/j.cnki.0256-1492.2017.06.013

2017 Vol. 37, No. 6

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Article navigation > Marine Geology & Quaternary Geology > 2017 > 37(6): 119-127

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LIU Xingjian, TANG Dehao, YAN Pin, GE Chendong, WANG Yanlin. CHARACTERISTICS OF AUTHIGENIC CARBONATES FROM A MEGA-POCKMARK ON THE EASTERN SIDE OF BAIYUN SAG,SOUTH CHINA SEA AND THEIR GEOLOGICAL SIGNIFICANCE[J]. Marine Geology & Quaternary Geology, 2017, 37(6): 119-127. doi: 10.16562/j.cnki.0256-1492.2017.06.013

Citation:

LIU Xingjian, TANG Dehao, YAN Pin, GE Chendong, WANG Yanlin. CHARACTERISTICS OF AUTHIGENIC CARBONATES FROM A MEGA-POCKMARK ON THE EASTERN SIDE OF BAIYUN SAG,SOUTH CHINA SEA AND THEIR GEOLOGICAL SIGNIFICANCE[J]. Marine Geology & Quaternary Geology, 2017, 37(6): 119-127. doi: 10.16562/j.cnki.0256-1492.2017.06.013

CHARACTERISTICS OF AUTHIGENIC CARBONATES FROM A MEGA-POCKMARK ON THE EASTERN SIDE OF BAIYUN SAG,SOUTH CHINA SEA AND THEIR GEOLOGICAL SIGNIFICANCE

1.
CAS Key Laboratory of Ocean and Marginal Sea Geology，South China Sea Institute of Oceanology,Guangzhou 510301,China
2.
Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510075, China
3.
Evaluation and Detection Technology Laboratory of marine mineral resources，Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
4.
School of Marine Science, Sun Yat-sen University, Guangzhou 510275, China
5.
Key Laboratory of Coast and Island Development, MOE, Nanjing University, Nanjing 210046, China

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Corresponding author: YAN Pin, yanpin@scsio.ac.cn

Received Date: 21 October 2017

Revised Date: 20 November 2017

Publish Date: 28 December 2017

Abstract

Abstract

A mega-pockmark, 1 500 m in diameter and 75 m in depth, is discovered on the east side of the Baiyun Sag, the South China Sea. Many irregular nodules are collected from the mega-pockmark and most of them characterized by fresh holes and seep passages. The mineral composition, microstructures, stable carbon and oxygen isotopes (δ¹³C and δ¹⁸O) of the five authigenic carbonates are used to trace the fluid source and their forming environment. Mineralogical study suggests that the five carbonates are all dominated by ferrous dolomite, followed by a detrital fraction, mainly composed of quartz and feldspar. The δ¹³C of the five carbonates falls in the range of -24.7‰~-10.9‰, indicating a primary source of 13C-depleted thermogenic methane. The δ¹⁸O of five carbonates varies between 5.6‰~6.9‰ V-PDB, indicating that the ¹⁸O-rich fluids are derived from the decomposition of gas hydrates and/or dehydration of clay minerals at depth. Gas hydrate may have existed in the sediment of the mega-pockmark. Ferrous dolomites in authigenic carbonates are formed in sediments and subsequently exposed to the seawater, indicating that the old methane seep was related to deep oil and gas seepage in the mega-pockmark. The live tubeworms and gas plumes in the pockmark suggest that methane seep is still active nowadays.
- east side of Baiyunsag /
- mega-pockmark /
- ferrous-dolomite /
- stable carbon and oxygen isotopes /
- methane seep

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References

[1]	罗敏, 吴庐山, 陈多福. 海底麻坑研究现状及进展[J]. 海洋地质前沿, 2012, 28(5): 33-42. Google Scholar LUO Min, WU Lushan, CHEN Duofu. Research status and progress of seabed pockmarks[J]. Marine Geology Frontiers, 2012, 28(5): 33-42. Google Scholar
[2]	Pilcher R, Argent J. Mega-pockmarks and linear pockmark trains on the West African continental margin[J]. Marine Geology, 2007, 244(1-4): 15-32. doi: 10.1016/j.margeo.2007.05.002 CrossRef Google Scholar
[3]	Gay A, Lopez M, Cochonat P, et al. Isolated seafloor pockmarks linked to BSRs, fluid chimneys, polygonal faults and stacked Oligocene-Miocene turbiditic palaeochannels in the Lower Congo Basin[J]. Marine Geology, 2006, 226(1-2): 25-40. doi: 10.1016/j.margeo.2005.09.018 CrossRef Google Scholar
[4]	Dondurur D, Çifçi G, Drahor M G, et al. Acoustic evidence of shallow gas accumulations and active pockmarks in the ⅰzmir Gulf, Aegean sea[J]. Marine and Petroleum Geology, 2011, 28(8): 1505-1516. doi: 10.1016/j.marpetgeo.2011.05.001 CrossRef Google Scholar
[5]	Reiche S, Hjelstuen B O, Haflidason H. High-resolution seismic stratigraphy, sedimentary processes and the origin of seabed cracks and pockmarks at Nyegga, mid-Norwegian margin[J]. Marine Geology, 2011, 284(1-4): 28-39. doi: 10.1016/j.margeo.2011.03.006 CrossRef Google Scholar
[6]	Benjamin U, Huuse M, Hodgetts D. Canyon-confined pockmarks on the western Niger Delta slope[J]. Journal of African Earth Sciences, 2015, 107: 15-27. doi: 10.1016/j.jafrearsci.2015.03.019 CrossRef Google Scholar
[7]	Wenau S, Spieβ V, Pape T, et al. Controlling mechanisms of giant deep water pockmarks in the Lower Congo Basin[J]. Marine and Petroleum Geology, 2017, 83: 140-157. Google Scholar
[8]	Luo M, Chen L Y, Wang S H, et al. Pockmark activity inferred from pore water geochemistry in shallow sediments of the pockmark field in southwestern Xisha Uplift, northwestern South China Sea[J]. Marine and Petroleum Geology, 2013, 48: 247-259. doi: 10.1016/j.marpetgeo.2013.08.018 CrossRef Google Scholar
[9]	Mazzini A, Svensen H, Hovland M, et al. Comparison and implications from strikingly different authigenic carbonates in a Nyegga complex pockmark, G11, Norwegian Sea[J]. Marine Geology, 2006, 231(1-4): 89-102. doi: 10.1016/j.margeo.2006.05.012 CrossRef Google Scholar
[10]	Haas A, Peckmann J, Elvert M, et al. Patterns of carbonate authigenesis at the Kouilou pockmarks on the Congo deep-sea fan[J]. Marine Geology, 2010, 268(1-4): 129-136. doi: 10.1016/j.margeo.2009.10.027 CrossRef Google Scholar
[11]	Hovland M, Svensen H. Submarine pingoes: Indicators of shallow gas hydrates in a pockmark at Nyegga, Norwegian Sea[J]. Marine Geology, 2006, 228(1-4): 15-23. doi: 10.1016/j.margeo.2005.12.005 CrossRef Google Scholar
[12]	冯先翠, 王伟, 王文倩, 等. 挪威海Nyegga麻坑区的甲烷成因自生碳酸盐岩[J]. 地球化学, 2015, 44(4): 348-359. doi: 10.3969/j.issn.0379-1726.2015.04.004 CrossRef Google Scholar FENG Xiancui, WANG Wei, WANG Wenqian, et al. Methane-derived authigenic carbonates in Nyegga pockmarks, offshore Mid-Norway[J]. Geochimica, 2015, 44(4): 348-359. doi: 10.3969/j.issn.0379-1726.2015.04.004 CrossRef Google Scholar
[13]	Mazzini A, Svensen H H, Planke S, et al. Pockmarks and methanogenic carbonates above the giant Troll gas field in the Norwegian North Sea[J]. Marine Geology, 2016, 373: 26-38. doi: 10.1016/j.margeo.2015.12.012 CrossRef Google Scholar
[14]	Feng D, Chen D F, Peckmann J, et al. Authigenic carbonates from methane seeps of the northern Congo fan: microbial formation mechanism[J]. Marine and Petroleum Geology, 2010, 27(4): 748-756. doi: 10.1016/j.marpetgeo.2009.08.006 CrossRef Google Scholar
[15]	Pierre C, Blanc-Valleron M M, Demange J, et al. Authigenic carbonates from active methane seeps offshore southwest Africa[J]. Geo-Marine Letters, 2012, 32(5-6): 501-513. doi: 10.1007/s00367-012-0295-x CrossRef Google Scholar
[16]	Gontharet S, Pierre C, Blanc-Valleron M M, et al. Nature and origin of diagenetic carbonate crusts and concretions from mud volcanoes and pockmarks of the Nile deep-sea fan (eastern Mediterranean Sea)[J]. Deep Sea Research Part Ⅱ: Topical Studies in Oceanography, 2007, 54(11-13): 1292-1311. doi: 10.1016/j.dsr2.2007.04.007 CrossRef Google Scholar
[17]	邸鹏飞, 黄华谷, 黄保家, 等. 莺歌海盆地海底麻坑的形成与泥底辟发育和流体活动的关系[J]. 热带海洋学报, 2012, 31(5): 26-36. doi: 10.3969/j.issn.1009-5470.2012.05.005 CrossRef Google Scholar DI Pengfei, HUANG Huagu, HUANG Baojia, et al. Seabed pockmark formation associated with mud diapir development and fluid activities in the Yinggehai Basin of the South China Sea[J]. Journal of Tropical Oceanography, 2012, 31(5): 26-36. doi: 10.3969/j.issn.1009-5470.2012.05.005 CrossRef Google Scholar
[18]	Sun Q L, Wu S G, Hovland M, et al. The morphologies and genesis of mega-pockmarks near the Xisha Uplift, South China Sea[J]. Marine and Petroleum Geology, 2011, 28(6): 1146-1156. doi: 10.1016/j.marpetgeo.2011.03.003 CrossRef Google Scholar
[19]	关永贤, 罗敏, 陈琳莹, 等. 南海西部海底巨型麻坑活动性示踪研究[J]. 地球化学, 2014, 43(6): 628-639. Google Scholar GUAN Yongxian, LUO Min, CHEN Linying, et al. Tracing study on the activity of mega-pockmarks in southwestern Xisha Uplift, South China Sea[J]. Geochimica, 2014, 43(6): 628-639. Google Scholar
[20]	Sun Q L, Wu S G, Cartwright J, et al. Shallow gas and focused fluid flow systems in the Pearl River Mouth Basin, northern South China Sea[J]. Marine Geology, 2012, 315-318: 1-14. doi: 10.1016/j.margeo.2012.05.003 CrossRef Google Scholar
[21]	拜阳, 宋海斌, 关永贤, 等. 利用反射地震和多波束资料研究南海西北部麻坑的结构特征与成因[J]. 地球物理学报, 2014, 57(7): 2208-2222. doi: 10.6038/cjg20140716 CrossRef Google Scholar BAI Yang, SONG Haibin, GUAN Yongxian, et al. Structural characteristics and genesis of pockmarks in the northwest of the South China Sea derived from reflective seismic and multibeam data[J]. Chinese Journal of Geophysics, 57(7): 2208-2222. doi: 10.6038/cjg20140716 CrossRef Google Scholar
[22]	Chen J X, Song H B, Guan Y X, et al. Morphologies, classification and genesis of pockmarks, mud volcanoes and associated fluid escape features in the northern Zhongjiannan Basin, South China Sea[J]. Deep Sea Research Part Ⅱ: Topical Studies in Oceanography, 2015, 122: 106-117. doi: 10.1016/j.dsr2.2015.11.007 CrossRef Google Scholar
[23]	Lu Y T, Luan X W, Lyu F L, et al. Seismic evidence and formation mechanism of gas hydrates in the Zhongjiannan Basin, Western margin of the South China Sea[J]. Marine and Petroleum Geology, 2017, 84: 274-288. doi: 10.1016/j.marpetgeo.2017.04.005 CrossRef Google Scholar
[24]	何家雄, 施小斌, 夏斌, 等. 南海北部边缘盆地油气勘探现状与深水油气资源前景[J]. 地球科学进展, 2007, 22(3): 261-270. doi: 10.3321/j.issn:1001-8166.2007.03.006 CrossRef Google Scholar HE Jiaxiong, SHI Xiaobin, XIA Bin, et al. The satus of the petroleum exploration in the northern South China sea and the resource potential in the deep-water areas[J]. Advances in earth science, 2007, 22(3): 261-270. doi: 10.3321/j.issn:1001-8166.2007.03.006 CrossRef Google Scholar
[25]	张洪涛, 张海启, 祝有海. 中国天然气水合物调查研究现状及其进展[J]. 中国地质, 2007, 34(6): 953-961. doi: 10.3969/j.issn.1000-3657.2007.06.001 CrossRef Google Scholar ZHANG Hongtao, ZHANG Haiqi, ZHU Youhai. Gas hydrate investigation and research in China: present status and progress[J]. Geology in China, 2007, 34(6): 953-961. doi: 10.3969/j.issn.1000-3657.2007.06.001 CrossRef Google Scholar
[26]	Yan P, Wang Y L, Liu J, et al. Discovery of the southwest Dongsha Island mud volcanoes amid the northern margin of the South China Sea[J]. Marine and Petroleum Geology, 2017, 88: 858-870. doi: 10.1016/j.marpetgeo.2017.09.021 CrossRef Google Scholar
[27]	天工. 我国海域天然气水合物试采成功[J]. 天然气工业, 2017, 37(5): 37. Google Scholar TIAN Gong. Gas hydrate in South China Sea was exploited successfully for the first time[J]. Natural Gas Industry, 2017, 37(5): 37. Google Scholar
[28]	杨少坤, 林鹤鸣, 郝沪军. 珠江口盆地东部中生界海相油气勘探前景[J]. 石油学报, 2002, 23(5): 28-33. doi: 10.3321/j.issn:0253-2697.2002.05.006 CrossRef Google Scholar YANG Shaokun, LIN Heming, HAO Hujun. Oil and gas exploration prospect of mesozoic in the eastern part of pearl river mouth basin[J]. Acta Petrolei Sinica, 2002, 23(5): 28-33. doi: 10.3321/j.issn:0253-2697.2002.05.006 CrossRef Google Scholar
[29]	阎贫, 王彦林, 郑红波. 南海北部白云凹陷-东沙岛西南海区的浅地层探测与深水沉积特点[J]. 热带海洋学报, 2011, 30(2): 115-122. doi: 10.3969/j.issn.1009-5470.2011.02.017 CrossRef Google Scholar YAN Pin, WANG Yanlin, ZHENG Hongbo. Characteristics of deep water sedimentation revealed by sub-bottom profiler survey over the Baiyun Sag-Southwest Dongsha Island Waters in the northern South China Sea[J]. Journal of Tropical Oceanography, 2011, 30(2): 115-122. doi: 10.3969/j.issn.1009-5470.2011.02.017 CrossRef Google Scholar
[30]	阎贫, 王彦林, 郑红波, 等. 东沙群岛西南海区泥火山的地球物理特征[J]. 海洋学报, 2014, 36(7): 142-148. doi: 10.3969/j.issn.0253-4193.2014.07.016 CrossRef Google Scholar YAN Pin, WANG Yanlin, ZHENG Hongbo, et al. Geophysical features of mud volcanoes in the waters southwest of the Dongsha Islands[J]. Acta Oceanologica Sinaca, 2014, 36(7): 142-148. doi: 10.3969/j.issn.0253-4193.2014.07.016 CrossRef Google Scholar
[31]	Gregg J M, Bish D L, Kaczmarek S E, et al. Mineralogy, nucleation and growth of dolomite in the laboratory and sedimentary environment: a review[J]. Sedimentology, 2015, 62(6): 1749-1769. doi: 10.1111/sed.12202 CrossRef Google Scholar
[32]	Rongemaille E, Bayon G, Pierre C, et al. Rare earth elements in cold seep carbonates from the Niger delta[J]. Chemical Geology, 2011, 286(3-4): 196-206. doi: 10.1016/j.chemgeo.2011.05.001 CrossRef Google Scholar
[33]	Roberts H H, Feng D, Joye S B. Cold-seep carbonates of the middle and lower continental slope, northern Gulf of Mexico[J]. Deep-Sea Research Part Ⅱ: Topical Studies in Oceanography, 2010, 57(21-23): 2040-2054. doi: 10.1016/j.dsr2.2010.09.003 CrossRef Google Scholar
[34]	Bian Y Y, Feng D, Roberts H H, et al. Tracing the evolution of seep fluids from authigenic carbonates: Green Canyon, northern Gulf of Mexico[J]. Marine and Petroleum Geology, 2013, 44: 71-81. doi: 10.1016/j.marpetgeo.2013.03.010 CrossRef Google Scholar
[35]	Mazzini A, Ivanov M K, Parnell J, et al. Methane-related authigenic carbonates from the Black Sea: geochemical characterisation and relation to seeping fluids[J]. Marine Geology, 2004, 212(1-4): 153-181. doi: 10.1016/j.margeo.2004.08.001 CrossRef Google Scholar
[36]	Vanneste H, Kastner M, James R H, et al. Authigenic carbonates from the Darwin Mud Volcano, Gulf of Cadiz: A record of palaeo-seepage of hydrocarbon bearing fluids[J]. Chemical Geology, 2012, 300-301: 24-39. doi: 10.1016/j.chemgeo.2012.01.006 CrossRef Google Scholar
[37]	Han X Q, Suess E, Sahling H, et al. Fluid venting activity on the Costa Rica margin: new results from authigenic carbonates[J]. International Journal of Earth Sciences, 2004, 93(4): 596-611. doi: 10.1007/s00531-004-0402-y CrossRef Google Scholar
[38]	Stakes D S, Orange D, Paduan J B, et al. Cold-seeps and authigenic carbonate formation in Monterey Bay, California[J]. Marine Geology, 1999, 159(1-4): 93-109. doi: 10.1016/S0025-3227(98)00200-X CrossRef Google Scholar
[39]	韩喜球, 杨克红, 黄永样. 南海东沙东北冷泉流体的来源和性质: 来自烟囱状冷泉碳酸盐岩的证据[J]. 科学通报, 2013, 58(19): 1865-1873. Google Scholar HAN Xiqiu, YANG Kehong, HUANG Yongyang. Origin and nature of cold seep in northeastern Dongsha area, South China Sea: Evidence from chimney-like seep carbonates[J]. Chinese Science Bulletin, 2013, 58(30): 3689-3697. Google Scholar
[40]	陈忠, 颜文, 陈木宏, 等. 南海北部大陆坡冷泉碳酸盐结核的发现: 海底天然气渗漏活动的新证据[J]. 科学通报, 2006, 51(9): 1065-1072. doi: 10.3321/j.issn:0023-074X.2006.09.011 CrossRef Google Scholar CHEN Zhong, YAN Wen, CHEN Muhong, et al. Discovery of seep carbonate nodules as new evidence for gas venting on the northern continental slope of South China Sea[J]. Chinese Science Bulletin, 2006, 51(10): 1228-1237. doi: 10.3321/j.issn:0023-074X.2006.09.011 CrossRef Google Scholar
[41]	Wang S H, Magalh es V H, Pinheiro L M, et al. Tracing the composition, fluid source and formation conditions of the methane-derived authigenic carbonates in the Gulf of Cadiz with rare earth elements and stable isotopes[J]. Marine and Petroleum Geology, 2015, 68: 192-205. doi: 10.1016/j.marpetgeo.2015.08.022 CrossRef Google Scholar
[42]	Vasconcelos C, McKenzie J A, Warthmann R, et al. Calibration of the δ18O paleothermometer for dolomite precipitated in microbial cultures and natural environments[J]. Geology, 2005, 33(4): 317-320. doi: 10.1130/G20992.1 CrossRef Google Scholar
[43]	Magalh es V H, Pinheiro L M, Ivanov M K, et al. Formation processes of methane-derived authigenic carbonates from the Gulf of Cadiz[J]. Sedimentary Geology, 2012, 243-244: 155-168. doi: 10.1016/j.sedgeo.2011.10.013 CrossRef Google Scholar
[44]	Riboulot V, Sultan N, Imbert P, et al. Initiation of gas-hydrate pockmark in deep-water Nigeria: Geo-mechanical analysis and modelling[J]. Earth and Planetary Science Letters, 2016, 434: 252-263. doi: 10.1016/j.epsl.2015.11.047 CrossRef Google Scholar
[45]	Greinert J, Bohrmann G, Suess E. Gas hydrate-associated carbonates and methane-venting at Hydrate Ridge: classification, distribution, and origin of authigenic lithologies[M]//Paull C K, Dillon W P. Natural Gas Hydrates: Occurrence, Distribution, and Dynamics. Washington D C: American Geophysical Union, 2001: 99-113. Google Scholar
[46]	Viola I, MagalhĀes V, Pinheiro L M, et al. Mineralogy and geochemistry of authigenic carbonates from the Gulf of Cadiz[J]. Journal of Sea Research, 2014, 93: 12-22. doi: 10.1016/j.seares.2014.04.007 CrossRef Google Scholar
[47]	卞友艳, 陈多福. 海底冷泉环境中的白云石(岩)研究现状[J]. 矿物岩石地球化学通报, 2014, 33(2): 238-246. doi: 10.3969/j.issn.1007-2802.2014.02.012 CrossRef Google Scholar BIAN Youyan, CHEN Duofu. Research progress of dolomite in seep carbonates[J]. Bulletin of Mineralogy, Petrology and Geochemistry, 2014, 33(2): 238-246. doi: 10.3969/j.issn.1007-2802.2014.02.012 CrossRef Google Scholar
[48]	Zhang F F, Yan C, Teng H H, et al. In situ AFM observations of Ca-Mg carbonate crystallization catalyzed by dissolved sulfide: Implications for sedimentary dolomite formation[J]. Geochimica et Cosmochimica Acta, 2013, 105: 44-55. doi: 10.1016/j.gca.2012.11.010 CrossRef Google Scholar
[49]	Jørgensen N O. Holocene methane-derived, dolomite-cemented sandstone pillars from the Kattegat, Denmark[J]. Marine Geology, 1989, 88(1-2): 71-81. doi: 10.1016/0025-3227(89)90005-4 CrossRef Google Scholar
[50]	Takeuchi R, Matsumoto R, Ogihara S, et al. Methane-induced dolomite “chimneys” on the Kuroshima Knoll, Ryukyu islands, Japan[J]. Journal of Geochemical Exploration, 2007, 95(1-3): 16-28. doi: 10.1016/j.gexplo.2007.05.008 CrossRef Google Scholar
[51]	陈忠, 杨华平, 黄奇瑜, 等. 南海东沙西南海域冷泉碳酸盐岩特征及其意义[J]. 现代地质, 2008, 22(3): 382-389. doi: 10.3969/j.issn.1000-8527.2008.03.006 CrossRef Google Scholar CHEN Zhong, YANG Huaping, HUANG Qiyu, et al. Diagenetic environment and implication of seep carbonate precipitations from the southwestern Dongsha area, South China Sea[J]. Geoscience, 2008, 22(3): 382-389. doi: 10.3969/j.issn.1000-8527.2008.03.006 CrossRef Google Scholar
[52]	Hovland M, Svensen H, Forsberg C F, et al. Complex pockmarks with carbonate-ridges off mid-Norway: Products of sediment degassing[J]. Marine Geology, 2005, 218(1-4): 191-206. doi: 10.1016/j.margeo.2005.04.005 CrossRef Google Scholar
[53]	Sahling H, Bohrmann G, Spiess V, et al. Pockmarks in the Northern Congo Fan area, SW Africa: Complex seafloor features shaped by fluid flow[J]. Marine Geology, 2008, 249(3-4): 206-225. doi: 10.1016/j.margeo.2007.11.010 CrossRef Google Scholar
[54]	Macdonald I R, Neilly J F, Guinasso N L, et al. Chemosynthetic mussels at a brine-filled pockmark in the northern gulf of Mexico[J]. Science, 1990, 248(4959): 1096-1099. doi: 10.1126/science.248.4959.1096 CrossRef Google Scholar