ཿ࢜ࢹ࣏ࣤࢫʻࡡ࣭࣍ࣛࣤࢡ࡞ࡻࡾ࣓ࣤࢪ࣭ࣤንິࡡ◂✪Study on the changes in Indian monsoon based on core-drilling at the Paleo-Kathmandu LakeỞ

◂✪௥⾪⩽ 㒿஬἖Ꮟ ᩅ᤭ ஐᕗኬᏕኬᏕ㝌Ẓ㍉♣ఌᩝ໩◂✪㝌⎌ሾንິ㒂㛓
Harutaka SAKAI, Professor, Faculty of Environmental Changes, Graduate School of Socialand Cultural Studies, Kyushu University

さ᪠㸯㐛ཡ 100 ୒ᖳࡡ୯ኳࣃ࣏ࣚࣕ༞ᩫ㟻ࡡཿẴು࣬ཿ⎌ሾࢅᚗඔࡊ㸡ࣃ࣏ࣚࣕ๑⦍ᒜᆀࡡ୕᪴ྍ࡛࢕ࣤ
ࢺ࣓ࣤࢪ࣭ࣤንິྍࡡࣛࣤࢢ࣭ࢩࢅよ᪺ࡌࡾ┘Ⓩ࡚㸡࢜ࢹ࣏ࣤࢫ⓽ᆀ༞㒂࡚῕ᗐ 㹢ࡡʻᠺᒒᇱᗇࢅ㈇㏳ࡌࡾ࣭࣍ࣛࣤࢡࢅ⾔ࡖࡒ㸣࣭࣍ࣛࣤࢡࢤ࢓モᩩ࡞ྱࡱࡿࡾẴು࡛⎌ሾࡡ྘⛸ᣞᵾ࡞ࡗ࠷࡙ฦᯊࢅ⾔࠹࡛ྜྷ᫤࡞㸡ᖳ௥㍂ࢅථࡿࡾࡒࡴ &28( ᖳ௥ῼᏽ࡛ཿᆀ☚Ẵῼᏽࢅ⾔ࡖࡒ㸣ࡆࡿࡱ࡚ࡡ◂✪࡞ࡻࡽ㸡㐛ཡ  ୒ᖳ๑ࡱ࡚ࡡẴುንິྍ࡛ཿ࢜ࢹ࣏ࣤࢫʻࡡ⎌ሾን㐼ྍࢅᚗඔࡌࡾࡆ࡛࠿࡚ࡀࡒ㸣ࡱࡒࣃ࣏ࣚࣕࡡ๑⦍ᒜᆀ࠿⣑ ୒ᖳ๑࡞᛬⃥࡝୕᪴ࢅ㛜ጙࡊࡒ⤎ᯕ㸡ἑᕖ࠿ሑࡀḾࡴࡼࡿཿ࢜ࢹ࣏ࣤࢫʻ࠿㄄⏍ࡊࡒࡆ࡛࠿᪺ࡼ࠾࡛࡝
ࡖࡒ㸣

Abstarct: In order to reconstruct the paleoclimate and paleo-environments in the southern slope of theCentral Himalaya and to clarify the linkage between uplift of frontal range of the Himalaya and valiability ofIndian monsoon, we undertook a core-drilling which penetrates the base of lacustrine sediments in thesouthern part of the Kathmandu basin. After analyses of the core, we have reconstructed history of changes inIndian monsoon and paleo-environments of the Paleo-Kathmandu Lake during the last 700 kyr. In addition,
we clarified that the frontal range of the Himalaya started its rapid uplift at 1Ma, which induced birth of thePaleo-Kathmandu Lake behind the range.

㸦㸣◂✪┘Ⓩճ ʻࡡ⎌ሾን㐼㸯㐛ཡ 100 ୒ᖳࡡཿ࢜ࢹ࣏ࣤࢫ ࣃ࣏ࣚࣕ࣬ࢲ࣊ࢴࢹᒜምࡡ㄄⏍࡞ఔࡖ࡙࢓ࢩ࢓

ʻࡡ⎌ሾንິྍࢅᚗඔࡌࡾࡡẴುࢨࢪࢷ࣑ࡡ୯ᰶࢅᠺࡌ࣓ࣤࢪ࣭ࣤẴು࠿⏍ࡆࡿࡼ㸨ࡗࡡ┘ᵾࡡࡒࡴ࡞㸡࢜ࢹ࣏ࣤࢫ⓽ᆀࡡʻࡱࡿ㸡ࡐࡡ୕᪴࡞ఔࡖ࡙࣓ࣤࢪ࣭ࣤẴುࡢንິࡊᠺᇼ✒∸ࢅࢤ࢓࣭࣍ࣛࣤࢡࡊ㸡ᅂ཭ࡊࡒࢤ࢓࡞ࡗ࡙ࡀࡒ࡛࠷ࢂࡿ࡙࠷ࡾ㸣ࡊ࠾ࡊ㸡ࡐࡡ୕᪴ྍ࡛Ẵ࠷࡙ 10ࠤ50cm 㛣㝰࡚྘⛸ࡡཿẴು࣬ཿ⎌ሾࡡንುንິྍࡡレ⣵ࡷ┞பࡡࣛࣤࢢ࣭ࢩ࡞ࡗ࠷࡙ࡢࡻ

ິᣞᵾ࡞ࡗ࠷࡙ฦᯊࢅ⾔࠷㸡200ࠤ2000 ᖳ⛤ᗐࡡࡂึࡖ࡙࠷࡝࠷㸣ࡱࡒ㸡㎾ᮅᮮࡡẴುንິࢅ஢ῼฦよ⬗ࢅࡵࡖࡒཿẴು࣬ཿ⎌ሾንິ᭜⥲ࢅᚗඔࡌࡌࡾࡒࡴ࡞㸡➠ᄿ⣎ࡡ㏻⤾ࡊࡒẴುንິྍࡡよ᪺ࡾࡆ࡛ࢅ┘ᣞࡊࡒ㸣ࡱࡒࢤ࢓࡞ࡗ࠷࡙ཿᆀ☚Ẵᒒࢅ┘ᣞࡊ࡙ୠ⏲୯࡚⢥ງⓏ࡞◂✪࠿⾔ࢂࡿ࡙࠷ࡾ

ᗆᏕⓏ◂✪࡛ AMS14C ᖳ௥ῼᏽࢅ⾔࠷㸡ንິ᭜⥲࠿㸡༞࢓ࢩ࢓ࡡ㝛୕࠾ࡼᚋࡼࡿࡒ㸡㏻⤾ཿẴುオ࡞ᖳ௥ࡡ┘┊ࡽࢅථࡿ㸡ࡆࡿࡼࡡᠺᯕ࡛ᆀ⾪ᆀ㈻㘋ࡢⓑ↋࡚࠵ࡾ㸣ࡐࡆ࡚ᮇ◂✪࡚ࡢ௧ୖࡡ㸨Ⅴ࡞

ㄢᰕࡡᠺᯕࢅెࡎ࡙㸡ࣃ࣏ࣚࣕࡡ๑⦍ᒜᆀࡡ୕᪴

↌Ⅴࢅ⤘ࡖ࡙◂✪ࢅ⾔ࡖࡒ㸣㛜ጙ᫤᭿࡛ཿ࢜ࢹ࣏ࣤࢫʻࡡᙟᠺ᫤᭿ࢅ≁ᏽࡌࡾձ ࣃ࣏ࣚࣕࡡ୕᪴㸯ࣃ࣏ࣚࣕࡡ๑⦍ᒜᆀࡡ୕᪴

ࡆ࡛ࢅ┘ᣞࡊࡒ㸣㛜ጙ᫤᭿ࢅ≁ᏽࡌࡾ㸧㸣◂✪⤊㐛ղ ࣓ࣤࢪ࣭ࣤንິ㸯㐛ཡ 100 ୒ᖳࡡ࢕ࣤࢺ࣓ࣤࢪ࣭ࣤࡡንິྍࢅᚗඔࡌࡾ

2002 ᖳᗐ࡞ࡢ㸡2000 ᖳ࡞⓽ᆀ୯ኳ㒂࡚ᐁ᪃ࡊࡒ1

2003 ᖳᗐ࡞ࡢ㸡⓽ᆀ༞㒂ࡡࢲࣔࣤࣅ࣭㸝Champi㸞࡚⣑ 114㹢ࡡ࣭࣍ࣛࣤࢡࢅ⾔࠷㸡ʻᠺᒒࡡᇱᗇࢅ㈇㏳ࡌࡾࢤ࢓ࢅ᤿ཱིࡌࡾࡆ࡛࠿࡚ࡀࡒ㸝CP ࢤ࢓㸞㸣ᆀ⾪㟚㢄࡛ࡡ㛭౿࠾ࡼ㸡ࡆࡡࢤ࢓ࡡᇱᗇ㒂ࡢ 100୒ᖳ௧୕๑࡞㐫ࡾࡆ࡛࠿᥆ᏽࡈࡿ࡙࠷ࡾ㸣ࡱࡒ㸡⛁Ꮥᢇ⾙ᣲ⮾ᶭᵋࡡ CS ᨲ㏞ࠔࢦ࢕࢙ࣤࢪࢲࣔࣤࢾࣜࠕࡡ␊⤄โష࡞༝ງࡊ㸡ࠖ᚜໩▴ࡡ 250 ୒ᖳ࣬ᆀ⌣⎌ሾࡡṌྍࠗࢅ⿿షࡊ㸡⌟ᅹࡵᨲ᫆୯࡚࠵ࡾ㸣2004 ᖳᗐ࡞ࡢ㸡㸧ᮇࡡࢤ࢓࡞ࡗ࠷࡙ⰴ⢂㸡⌓⸬㸡ᇼ✒∸㸡⢋ᅰ㹍⥲ฦᯊ㸡᭯ᶭ࣬↋ᶭฦᯊ㸡AMS14 Cᖳ௥ῼᏽ㸡ཿᆀ☚Ẵῼᏽ࡝࡜ࢅᐁ᪃ࡌࡾ࡛ྜྷ᫤࡞㸡ࢤ࢓ࡡᇼ✒ᏕⓏオ㍍ࢅ⾔ࡖࡒ㸣ࡱࡒ㸡⓽ᆀ༞㒂ࡡ
ᆀ㈻ㄢᰕࢅ⤽⤾ࡊ࡙⾔࠷㸡➠ᄿ⣎ᒒฦᕱᇡࡡᆀ㈻ᅒࢅ 60㸚⛤ᗐᏰᠺࡊࡒ㸣ࡆࡿࡼࡡ◂✪ᠺᯕ࡞ࡗ࠷
࡙ࡢ㸡Ẏᖳ㸦ᅂ◂✪㞗ఌࢅ㛜തࡊ㸡ࢸ࣭ࢰࡡஹᥦ
࡛よ㔐࡞㛭ࡌࡾ㆗ㄵࢅ⾔ࡖࡒ㸣ࡈࡼ࡞
ࠔHimalaya-Tibet-KarakoramWorkshopࠕ㸡ࠔᅗ㝷ⰴ⢂
Ꮥఌࠕ㸡
ࠔIGCP-476Monsoon Evolution and Tectonic–Climate Linkage in Asia Symposiumࠕ࡝࡜ࡡᅗ㝷Ꮥఌ㸡࠽ࡻࡦ᪝ᮇᆀ㈻Ꮥఌࡷᆀ⌣ᝠ᫅⛁ᏕྙྜྷᏕఌ
࡝࡜࡚◂✪ᠺᯕࢅⓆ⾪ࡊࡒ㸣㸨㸣◂✪ᠺᯕ
3.1 ࣃ࣏ࣚࣕ๑⦍ᒜᆀࡡ୕᪴ ࢜ࢹ࣏ࣤࢫ⓽ᆀ༞⦍㒂࡞ฦᕱࡌࡾἑᕖ࣬‭ᆀᇼ

Fig. 2 2003 ᖳ⚽࡞ᐁ᪃ࡊࡒ࣭࣍ࣛࣤࢡ(CP ᆀⅤ)✒∸ࡡࣜࢠࣤࢺ࣭ࣜᒒ࡛୕నࡡᡢ≟ᆀ♗㈻ᇼ✒∸࢕ࢰ࢕ࢷ࢔ᒒࡡሾ⏲ࡡᖳ௥ࡢ㸡ཿᆀ☚ẴᏕⓏ◂✪
࠾ࡼࣀ࣐ࣚࣞ࣬࢕࣊ࣤࢹ㸝107ࠤ99 ୒ᖳ๑㸞୕㒂࡚࠵ࡾࡆ࡛࠿ึ᪺ࡊࡒ㸣ࡱࡒࣜࢠࣤࢺ࣭ࣜᒒ᭩୕㒂ࡢ㸡༞᪁࠾ࡼࡡᅰ▴Ὦᇼ✒∸࡛ࡐࡿ࡞ࡻࡖ࡙ሑࡀḾࡴࡼࡿࡒʻࡡᇼ✒∸࠾ࡼᵋᠺࡈࡿ࡙࠽ࡽ㸡ࡐࡿࢅしࡖ࡙༞᪁ࡡࣃ࣏ࣚࣕ๑⦍ᒜᆀ࠾ࡼ౩⤝ࡈࡿࡒᡢ≟ᆀ♗ᒒ࠿ཉࡂᇼ✒ࡊ࡙࠷ࡾࡆ࡛࠿ึ᪺ࡊࡒ㸣Fig.3࣭࣍ࣛࣤࢡ࡚ᚋࡼࡿࡒ᭯ᶭ㈻ʻᠺᇼ✒∸ࡡࢤ࢓ࡆࡿࡱ࡚ࡡᇼ✒ᏕⓏ◂✪࡛ెࡎࡾ࡛㸡๑⦍ᒜᆀࡡ

࣭࣍ࣛࣤࢡ࡚ᚋࡼࡿࡒධ㛏 218㹢ࡡࢤ࢓㸝RB ࢤ

᛬㏷࡝㝧㉫㛜ጙ࡞ࡻࡽ⣑ 100 ୒ᖳ๑࡞ἑᕖ࠿ሑࡀ

࢓㸞ࡡ྘⛸ฦᯊࢅ⾔࠹࡛ྜྷ᫤࡞㸡ཿᆀ☚Ẵ࡛ᖳ௥Ḿࡴࡼࡿ㸡ࡐࡡ⤎ᯕཿ࢜ࢹ࣏ࣤࢫʻ࠿㄄⏍ࡊࡒࡆࡡῼᏽࢅ⾔ࡖࡒ㸣࣭࣍ࣛࣤࢡషᴏࡢභ⏐ࢣࣛࣚࡡ࡛࠿᪺ࡼ࠾࡞࡝ࡖࡒ㸣ࡱࡒ㸡ྜྷ᫤᭿࡞ࢨ࣭࣠ࣛࢠ

Ὡິ࠿ὩⓆ࡚⌟ᆀࡡ♣ఌ≟Ἓ࠿୘Ꮽᏽ࡚࠵ࡖࡒࡒ

ᒒ⩄࡚ࡢ᩷ᒒ㐘ິ࡞ఔ࠹୕᪴࠿ὩⓆ໩ࡊ㸡ࣅ࣭࢟ࡴ㸡13.5㹢ࡡ▯࠷モ㥺Ⓩᤸ๎ࢅ Tau Daha ࡚ᐁ᪃ࡊࣁࢴࢠ⓽ᆀ࡞ࡢᡢ≟ᆀᛮᕠ♗ᒒ࠿ᇼ✒ࡊ࡙࠷ࡾࡆࡒࡓࡄ࡞⏻ࡱࡖࡒ㸣࡛࠾ࡼ㸡๑⦍ᒜᆀࡡ୕᪴ࡡཋᅄࡢ㸡ࣈ࣭ࣝࢹሾ⏲2

᩷ᒒ࠿MBT࠾ࡼ༞᪁ࡡMFT࡞ࢩࣔࣤࣈࡊࡒࡆ࡛

ࡡ᭩┊᭿࠿⤂஡ࡊࡒ├ᚃࡡ2ࠤ1.9 ୒ᖳ๑࠾ࡼῺᬦ

࡞ఔ࠷᩺ࡒ࡝ỷࡲ㎲ࡲ࠿㛜ጙࡊࡒࡆ࡛࡞ịࡴࡼࡿ໩࠿ጙࡱࡖ࡙࠽ࡽ㸡༞ᴗ࿔㎰ᾇᇡࡷ㉝㐠ኯᖲὊᆀࡾ㸣ᇡ࡛ࡢྜྷ᭿ࡊ࡙࠷ࡾ࠿㸡໪ኬこὊᆀᇡ࡞Ẓ࡬ࡾ࡛
ᩐ 1000 ᖳ᪡࠷㸣

Fig. 4 ࣃ࣏ࣚࣕ๑⦍ᒜᆀࡡ୕᪴࡞ఔ࠷ἑᕖ࠿ሑࡀ࡛ࡴࡼࡿ㸡⣑100 ୒ᖳ๑࡞ཿ࢜ࢹ࣏ࣤࢫʻ࠿㄄⏍ࡊࡒࡆ࡛ࢅ♟ࡌᶅᘟ᩷㟻ᅒ

Fig. 6 ࣭࣍ࣛࣤࢡࢤ࢓ࡡฦᯊ࠾ࡼᚗඔࡈࡿࡒ࢜ࢹ࣏ࣤࢫ⓽ᆀࡡ㐛
ཡ75 ୒ᖳ㛣ࡡẴು࣬⎌ሾንິオ㘋Fig. 5ࣈ࣭ࣝࢹሾ⏲᩷ᒒ࠿ 2'9࠾ࡼ༞᪁ࡡ 2+9 ࡞ࢩࣔࣤࣈࡊ㸡ࡐࡆ࡚࢕ࣤࢺࣈ࣭ࣝࢹࡡỷࡲ㎲ࡲ࠿ጙࡱࡾࡆ࡛࡞ࡻࡖ࡙ࣃ࣏ࣚࣕ๑⦍ᒜᆀࡢ⣑ ୒ᖳ๑࡞୕᪴ࢅ㛜ጙࡊࡒ㸣1: Lower Siwalik㸡
2: Middle Siwalik㸡3: Upper Siwalik㸡4: Upper Siwalik ᭩୕㒂ࡡᕠ♗ᒒ࡛࢜ࢹ࣏ࣤࢫ⓽ᆀ༞᪁ࡡᡢ≟ᆀ♗ᒒ㸡࢜ࢹ࣏ࣤࢫ⓽ᆀࡡʻ
ᠺᒒ

3.2

࢕ࣤࢺ࣓ࣤࢪ࣭ࣤንິྍࡡᚗඔ

Fig. 7࣭࣍ࣛࣤࢡࢤ࢓ࡡ᭩୕㒂 40m ࡞オ㘋ࡈࡿࡒ᭩⤂ể᭿ᮆ᭿ ࢜ࢹ࣏ࣤࢫ⓽ᆀ୯ኳ㒂࠾ࡼᚋࡼࡿࡒ RB ࢤ࢓࡞ࡡẴು࣬⎌ሾንິオ㘋࡛ࢡ࣭ࣛࣤࣚࣤࢺ࡛༞ᴗ࠾ࡼሒ࿈ࡈࡿࡒ

ࡗ࠷࡙྘⛸ࣈࣞ࢞ࢨ࣭ࡡฦᯊࢅ⾔ࡖࡒ㸣ࡐࡡ⤎ᯕ㸡Ẵುንິオ㘋ࡡẒ㍉

௧ୖࡡࡆ࡛࠿᪺ࡼ࠾࡞࡝ࡖࡒ㸣 ⰴ⢂໩▴࡛᭯ᶭ∸ฦᯊ࡞ࡻࡽ㸡࢜ࢹ࣏ࣤࢫ࡚ࡢ

3.3 ཿ࢜ࢹ࣏ࣤࢫʻࡡ⎌ሾን㐼ྍࡡᚗඔ㐛ཡ⣑ 70 ୒ᖳࡡ㛣࡞㸭ᅂࡡῺᬦ᭿࡛ᐨ෫᭿࠿⧖ ⌓⸬໩▴ࡡ◂✪࡞ࡻࡾ࡛㸡ཿ࢜ࢹ࣏ࣤࢫʻࡡʻ

ࡽ㏁ࡊ࡙࠽ࡽ㸡ࡐࡿࡢᆀ⌣ぞᶅࡡểἑ᭿࡛㛣ể᭿Ềనࡢ 8 ᅂኬࡀࡂ఩ୖࡊ࡙࠷ࡾ㸣ࡆࡡ᫤᭿ࡢⰴ⢂࡞ᑊᚺࡊ࡙࠷ࡾ㸝MIS 2ࠤMIS17㸞㸣ࡱࡒᮇᆀᇡ࡚໩▴ࡷ᭯ᶭ∸ࡡฦᯊ࡚ࡢᐨ෫ஜ⇩࡝᫤᭿ࢅ♟ࡌࡆࡢể᭿࡞ࡢᐨ෫࡚ஜ⇩㸡㛣ể᭿࡞ࡢῺᬦ࡚‭₮࡚࡛࠾ࡼ㸡ểἑ᭿࡞ࡢʻỀన࠿఩ୖࡊࡒࡵࡡ࡛⩻࠻࠵ࡖࡒ㸣⣑ 40 ୒ᖳ๑ࡡ MIS11 ࡞┞ᙔࡌࡾ᫤᭿࡞

ࡼࡿࡾ㸣ࡱࡒࡆࡡ᫤᭿࡞ࡢ TOC ⃨ᗐ࡛ C/N Ẓࡢࡢ㸡ᴗࡴ࡙㧏Ὼ‭₮࡚㸡⏍∸⏍⏐㔖࠿㧏ࡂ㸡⣑ 40఩ࡂ㸡ț13㸸ೋࡢ㧏࠷㸣ᚉࡖ࡙㸡ᐨ෫࡝᫤᭿࡞ࡢ୒ᖳ๑ࢅሾ࡞⏍∸ࡡ⏍⏐㔖ࡢ⃥΅ࡊࡒ㸣ࣃ࣏ࣚࣕ㝛୕㉫″᭯ᶭ∸ࡡὮථࡢᑛ࡝ࡂ㸡C㸩᳔∸࠿ᣉኬࡡᒜᒾểἑࡢῺᬦ࡝㛣ể᭿࡞๑㐅ࡊ࡙࠷ࡾ࠿㸡ࡆࡊࡒࡆ࡛࠿᥆ᏽࡈࡿࡾ㸣ࡱࡒ⢋ᅰ㖌∸ࡡฦᯊ࡞ࡻࡿࡢῺᬦ‭₮࡝ኬẴ࠿Ὼᬦ᭿࡞ࡢࣃ࣏ࣚࣕࡡἑㆺ

ࡾ࡛ᐨ෫᭿࡞ࡢᇼ✒㏷ᗐࡢ㐔ࡂ 0.3ࠤ0.7㹢/kyr ࡚࡞Ἒࡖ࡙ዚ῕ࡂࡱ࡚ථࡽ㎲ࡲ㸡ࡐࡡ⤎ᯕ㜾㞯㔖࠿࠵ࡾ࠿㸡Ὼᬦ᭿࡞ࡢᇼ✒㏷ᗐࡢ㏷ࡂ 3ࠤ4.3㹢/kyrቌຊࡊࡒࡆ࡛ࢅ♟ࡌ㸣࢜ࢹ࣏ࣤࢫ࡚ࡢ᭩⤂ểἑ᭿࡞ቌຊࡊ࡙࠷ࡾ㸣ࡱࡒ⢋ᅰ㖌∸ࡡྱ᭯㔖ࡵῺᬦ‭3₮᭿࡞ࡢቌຊࡊ㸡ᐨ෫ஜ⇩᭿࡞ࡢ΅ᑛࡊ࡙࠽ࡽ㸡 ⣑ ୒ᖳ๑࡞┞ᙔࡌࡾ῕ᗐ⣑㹢ࡱ࡚ࡡࢤ࢓࡞࢕ࣚ࢕ࢹࡡ⤎ᬏ໩ᗐࡵࡐࡿ࡞ᑊᚺࡊ࡙ஜ⇩᭿࡞ࡢࡗ࠷࡙ࡢ㸡ୠ⏲Ⓩ࡞㧏࠷᫤㛣⢥ᗐ࡚ࡡ㆗ㄵ࠿⾔ࢂ㧏ࡂ㸡‭₮᭿࡞ࡢ఩ࡂ࡝ࡖ࡙࠷ࡾ㸣ࡆࡿࡢ༳ࡔῺࡿ࡙࠷ࡾࡡ࡚㸡⣑  ᖳࡡᖳ௥ฦよ⬗ࢅࡵࡖࡒ㆗

ᬦ᭿࡞ࡢ໩ᏕⓏ㢴໩ష⏕࠿ಀ㐅ࡈࡿࡒࡒࡴ࡚࠵ࡾ㸣ㄵ࠿࡚ࡀࡾࡻ࠹࡞㸡HP 㛣㝰࡚྘⛸ฦᯊࢅ⾔࠷㸡ንິ᭜⥲ࢅᚋࡾࡆ࡛࠿࡚ࡀࡒ㸣ࡊ࠾ࡊ㸡ࢤ࢓୯ࡡ᭯ᶭ∸ࡡᇼ✒ࡊࡒᖳ௥࡛᭯ᶭ∸ᙟᠺᖳ௥ࡡᕣ࠿࠵ࡾࡒࡴ㸡⢥ᗐࡡ㧏࠷ᖳ௥㍂ࢅථࡿࡾࡆ࡛࠿࡚ࡀ࡝࠷࡚࠷ࡾ㸣௑ᚃ㸡᭯ᶭ∸ࡡ⢇ᙼࢅᥖ࠻ࡒモᩩ࡞ࡗ
࠷࡙ &28( ᖳ௥ῼᏽࡌࡾ࡝࡜ࡊ࡙㸡⢥ᗐࢅ୕ࡅࡾᚪさ࠿࠵ࡾ㸣 ᮇ◂✪ࡡᠺᯕࡢ㸡㎾࠷ᑑᮮᐁ᪃ࡈࡿࡾ஢ᏽࡡ࣓ࣤࢪ࣭ࣤẴುୖ࡞࠵ࡾ࢓ࣚࣄ࢓ᾇࡷ࣊ࣤ࢝ࣜ‬࡝Fig. 8⢋ᅰ㖌∸ࡡฦᯊ࠾ࡼᚗඔࡈࡿࡒ㐛ཡࠤ ୒ᖳ๑ࡡ࢜ࢹ࣏࡜ࡡ⤣ྙ῕ᾇᤸ๎ゝ⏤㸝.4)5㸞࡞ࡵኬࡀ࡝ᙫ㡢ࢅࣤࢫ⓽ᆀࡡཿẴು࣬ཿ⎌ሾࡡን㐼࠽ࡻࡦࡐࡡ༞ᴗࡡ㓗⣪ྜྷనమ୙࠻ࡾ࡛ྜྷ᫤࡞㸡ᾇὊ࠾ࡼᚋࡼࡿࡒࣃ࣏ࣚࣕࡡ୕Ẓንິ᭜⥲࡛ࡡẒ㍉࡛࣓᪴ࣤࢪ࣭ࣤንິࡡオ㘋࡛Ẓ㍉ࡌࡾࡒࡴࡡ㈏㔔࡝㝛୕ࡡオ㘋࡛࡝ࡾࡆ࡛࠿஢᝷ࡈࡿࡾ㸣 ⣑ 60ࠤ30 ୒ᖳ๑ࡡ㛣ࡢ㸡ࡆࡡʻࡡᅖ᭯⛸࡚࠵ࡾ⌓⸬࠿ᅸ಻Ⓩ࡞ඁເ࡚㸡⏍∸″࢛ࣂ࣭ࣜࡡ⏍⏐㔖

㸪㸣Ⓠ⾪ㄵᩝࣛࢪࢹࡵኣࡂ࡝ࡾ㸣ࡆࡡ᫤᭿࡞ࣁ࢕࢜ࣜʻ࡚ࡵྜྷᵕ࡝ን㒿஬἖Ꮟ㸝㸞ࣃ࣏ࣚࣕᒜ⬞࡛ࢲ࣊ࢴࢹ㧏ཋࡡ໩࠿㉫ࡆࡖࡒࡆ࡛࠿ሒ࿈ࡈࡿ࡙࠽ࡽ㸡ྜྷ᫤᭿࡞࢓୕᪴ࣈࣞࢬࢪ࣓ࣤࢪ࣭ࣤࢨࢪࢷ࣑ࡡ㄄⏍࡛ንິࢩ࢓༞㒂࡚ࡵ໪㒂හ㝛㒂࡚ࡵභ㏳ࡊࡒ⏍∸ࡡ࢕࣊

࡛࠷࠹っⅤ࠾ࡼᆀ㈻Ꮥ㞟ヽ㸡 ᕬࣤࢹ࠿㉫ࡀ࡙࠷ࡾࡻ࠹࡚࠵ࡾ㸣㒿஬἖Ꮟ㸝㸞ࣃ࣏ࣚࣕᒜ⬞ࡡ୕᪴ࡡࢷࢠࢹࢼࢠࢪ㸣ᆀᏕ㞟ヽ㸡 ᕬ㸡㸣㸩㸣௑ᚃࡡㄚ㢗࡛ᒈ᭻ ⌟ᅹᢢ࠻࡙࠷ࡾ᭩ኬࡡၡ㢗Ⅴࡢ㸡ᚋࡼࡿࡒ  ᮇHarutaka Sakai , Hideo Sakai , Wataru Yahagi , Rieࡡࢤ࢓࡞ḿ☔࡝ᖳ௥ࡡ┘┊ࡽࢅථࡿࡾࡆ࡛࡚࠵ࡾ㸣

Pleistocene rapid uplift of the Himalayan frontal ranges

7' ࢤ࢓࡞ࡗ࠷࡙ࡢ㸡ཿᆀ☚Ẵῼᏽ࡞ࡻࡽึ᪺ࡊࡒrecorded in the Kathmandu and the Siwalik basins．

ᆀ☚Ẵ࢙ࢠࢪ࣭࢜ࢨࣘࣤࢅฺ⏕ࡊ࡙ᖳ௥ࡡ┘┊ࡽ

Palaeogeogr. Palaeoclimatol. Palaeoecol.

ࢅථࡿࡾࡆ࡛ࢅモࡲ࡙࠷ࡾ㸣ࡊ࠾ࡊ㸡ࡆࡡࢤ࢓ࡡ

Harutaka Sakai,, Minoru Sawada, Yutaka Takigami ,ᇱᗇ࠿ࣇࣜࣤࢽᮿᒜሾ⏲㸝⣑  ୒ᖳ๑㸞࡞㐡ࡊYuji Orihashi , Tohru Danhara, Hideki Iwano, Qi࡙࠷࡝࠾ࡖࡒࡒࡴ࡞㸡࢙ࢠࢪ࣭࢜ࢨࣘࣤࡡᑊẒ࡞Dong, Huawei Cai and Jianguo LiỞ 㸝ᢖ✇୯㸞Geologyၡ㢗࠿ṟࡈࡿ࡙࠷ࡾ㸣⌟ᅹ (5 ࢤ࢓࡞ࡗ࠷࡙ࡵཿᆀ

on the summit of Mt. Qomolangma (Mt. Everest) and☚Ẵῼᏽࢅᐁ᪃ࡊ࡙࠷ࡾ࠿㸡ࡆࡡࢤ࢓࡞ࡗ࠷࡙ࡢ

metamorphic and cooling ages of the Yellow Band.

ࣇࣜࣤࢽᮿᒜሾ⏲ࢅ㉲࠻㸡ࣀ࣐ࣚࣞ࣬࢕࣊ࣤࢹ
㸝⣑Island Arc （Special Issue of 19th HKT）.

ࠤ ୒ᖳ๑㸞࡞㐡ࡊ࡙࠷ࡾ㸣ᚉࡖ࡙ (5 ࢤ࢓ࡡHarutaka Sakai and Yutaka Takigami 㸝ᢖ✇୯㸞ཿᆀ☚Ẵῼᏽ࠿Ᏸ஡ࡊ㸡ᆀ☚Ẵ࢙ࢠࢪ࣭࢜ࢨࣘࣤ

Problematic Late Pliocene age of plant fossil - bearingࡡ┘┊ࡽࢅථࡿࡾࡆ࡛࠿࡚ࡀࡿࡣ㸡ಘ㢏ᗐࡡ㧏࠷

beds on the northern slope of Mt. Shisha Pangma,ᖳ௥ࡡ┘┊ࡽ࠿ථࡖࡒ㸡༞࢓ࢩ࢓ࡡࢪࢰࣤࢱ࣭ࢹ

central Himalaya. Island Arc（Special Issue of 19th࡛࡝ࡾཿẴು࣬ཿ⎌ሾንິ᭜⥲ࢅᥞ♟ࡌࡾࡆ࡛࠿HKT）.

Fujii, Tatsuya Hayashi, Bishal Nath Upreti 㸝ᢖ✇୯㸞࡚ࡀࡾ㸣4