1期陈杰等 : 祁连山北缘玉门砾岩的磁性地层年代与褶皱过程 21 图 1 祁连山北缘老君庙逆断裂 - 褶皱带地形及构造横剖面 ( a) 祁连山北缘酒西盆地 DEM 地形及磁性地层剖面位置据野外填图霍永录等 [ 23 ] 霍永录等 ATF 阿尔金走滑断裂 ( 1) 青草湾背斜 Q Gb 戈壁组

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1 QUATERNARY SC IENCES Vol. 26, No. 1 January, (2006) K. H. W yrwoll B. Krapez (, ; School of Earth and Geographical Sciences, University of W estern Australia, Nedlands 6907, Australia) -,,, 4Ma, 3155Ma 3Ma, 260m /Ma 170m /Ma, 112Ma - 718km /Ma - 3 4,, P539. 3, P A 1, ( ) [ 1 5 ],,,, [ 1, 3, 6 14 ], [ 8 12, ],,, ( growth strata ) [ 18 ], ( syntectonic strata) [ 19 ],, [ 18, ],,, 2 SWW -NEE : 39 E2mail: chenjie@eq2igl1ac1cn 3 ( : , , ) DAAD ,

1期陈杰等 : 祁连山北缘玉门砾岩的磁性地层年代与褶皱过程 21 图 1 祁连山北缘老君庙逆断裂 - 褶皱带地形及构造横剖面 ( a) 祁连山北缘酒西盆地 DEM 地形及磁性地层剖面位置据野外填图霍永录等 [ 23 ] 霍永录等 ATF 阿尔金走滑断裂 ( 1) 青草湾背斜 Q Gb 戈壁组 ( 2) 鸭儿峡背斜 QJq 酒泉组等资料编绘 ) [ 24 ] ( b)

2 1期陈杰等 : 祁连山北缘玉门砾岩的磁性地层年代与褶皱过程 21 图 1 祁连山北缘老君庙逆断裂 - 褶皱带地形及构造横剖面 ( a) 祁连山北缘酒西盆地 DEM 地形及磁性地层剖面位置据野外填图霍永录等 [ 23 ] 霍永录等 ATF 阿尔金走滑断裂 ( 1) 青草湾背斜 Q Gb 戈壁组 ( 2) 鸭儿峡背斜 QJq 酒泉组等资料编绘 ) [ 24 ] ( b) 石油河西老君庙背斜构造横剖面 (剖面位置见图 1a, ( c) 老君庙背斜北翼牛胳套沟实测地质剖面示生长地层结构 NQFT 祁连山北缘逆断裂 (带齿一侧为断层上盘 ) ( 3) 老君庙背斜 Q Ym 玉门组 ( 4) 石油沟背斜 Ns 疏勒河组 ( 5) 青头山推覆构造 E3 - N 1b 白杨河组 CF 昌马断裂 ( 6) 白杨河逆断裂 - 褶皱带 M z - Pz 前古 - 新近系基底 A1, A2, A3, A4 和 A5 分别代表 5 个地层层序 ; U1, U2, U 3 和 U4 分别为不整合面 Fig. 1 Topographic map ( a ) and cross2sections ( b) of the Laojunm iao fold2and 2thrust belt of Northern Q ilian Shan 向的阿尔金走滑断裂带与青藏高原东北缘 NW - SE 走向的祁连山北缘逆断裂带的转换带上 (图 1a ) 晚新生代强烈的构造运动, 由南而北在盆地形成了南部山前老君庙逆断裂 - 褶皱带中央坳陷带北部单 [ 23, 24 ] 斜斜坡带 3 个次级构造单元南部山前老君庙逆断裂 - 褶皱带位于酒西盆地的南部 (海拔高度 m ), 西起青草湾西, 经鸭儿峡石油河青头山,止于小红泉以东,呈北西

3 ,, 70km ( 1a) - (M z - P z ) ( E 3 - N 1b?) (N s?) (Q Ym?) (Q Jq ) (Q Gb ), m,, - [ 23, ], m,,,,,, [ 23, ], -,,,, [ 33 ] [ 17 ],, m,,, 1 2m,,, 160cm,, m ( ), 20 40m - [ 24 ] ( 1a), NNE - NE - ( tear fault, 509 ) [ 23, 24 ],,,,,, 5 40, 50 90,, [ 23, 24 ] ( 1b) 500m, 10km, 5km -, [ 23, 24 ] 12km, 5km 10 15, ( ) [ 3, ], ( ),,,,, - [ 23 ] 2km 16km ( N, E ) ( N, E), m, 5 70m,, 693m 141 ( ), 756m 74 ( ) 2 4 [ 5 ],

4 1 : 23, 2G 755 SRM DC2SQU ID ( emu) 215 ( 1, 141, 74 ), 2 3 ( 40, 20 ) 2G ( [ 5 ] ) 3 ( 5mT 10mT), , (,, ),, (LTC) 150, ( HTC) ( 2),, ( N511 Q9411) ( Q8911) 300,, ,,,, ( N912) 2 ( ) AF ( Gauss), T ( ) = 10-6 emu;,, Fig. 2 Rep resentative Zijderveld and equal2area p rojection p lots from demagnetization experiments ( all in Tilt2corrected coordinates)

5 ,, 300,, N. R. Nowaczyk C. H. Jones [ 34 ], Kirschvink [ 35 ] 3 ( 4 8 ) ( ) (MAD ) 10, MAD 5 24, 157 ( 87% ) ( 3a), 89 ( 95% ) ( 3b) McFadden McElhinny [ 36 ] ( 3) ( common distribution test), 66157% ( k ), 3 ( a) ( b) ( ) ( ), 95%, Fig. 3 Reversal tests of paleomagnetic stability in the Q ingcaowan and N iugetao sections respectively

1 : 25 8152, 11126 ( 95% ), C ( 98185% ), 43116% ( k ), 13118, 1412 ( 95% ), C ( 97175% ), 312 ( virtual geomagnetic pole, VGP) VGP, ( 4) 8 ( r1 r8) 8 a h ( 4) 7 r4 r9 8 c j ( 4) f h f j 5 40cm,, c,

6 1 : , ( 95% ), C ( 98185% ), 43116% ( k ), 13118, 1412 ( 95% ), C ( 97175% ), 312 ( virtual geomagnetic pole, VGP) VGP, ( 4) 8 ( r1 r8) 8 a h ( 4) 7 r4 r9 8 c j ( 4) f h f j 5 40cm,, c, r4, d, r5, e, r6, f, r7, g r8 ( 4),, [ 23, ],, 20Ma ( r4 g), Cande Kent [ 37 ] 30Ma, r1 h 4 ( a) ( b) VGP [ 37 ] A1 A5 U1 U3 1c Fig. 4 L ithology and magnetostratigraphic results from N iugetao section ( a) and Q ingcaowan W est section ( b) with declination and VGP latitude p lotted against stratigraphic height and correlation to the GPTS of Cande and Kent ( 1995)

7 C3n14n C2n (O lduvial ),,, Reunion ( Ma), 3 j i B runhes Jaram illo ; Jaram illo Cobb M t, m /Ma;,,, j i B runhes Cobb M t 4 ( 5),, 196m /Ma, 3Ma, 260m /Ma 170m /Ma ( 5), 5 3Ma Fig. 5 Age versus stratigraphic thickness p lot of the Q ingcaowan and N iugetao sections using data and correlations from Fig. 4, 4Ma, 3155Ma ( 4),,,, 170m /Ma, 017Ma, < 017Ma [ 38 ], [ 21, ] ( limb rotation), (m igrating hinge), ( growth triangles), - ( tishear),, [ 44 ], [ 14, 19, 21, 22 ] ( t), R U /R T = (U / t) / ( T/ t) =U /T, R U U, R T T -, (U1),, ( 1b 1c ), ( p regrowth strata) (A0) ( 1b) A1 (Q Gb ) ( ), ( 1b 1c),

8 1 : 27 12, - 4, 5 ( 1c) (1) A1 ( m, 48m, ) :,, A0, A0 NE18 017Ma,, NE ( U /T > > 1, Re > > 0, ( 1c) ;, 24 ),, [ 1 ], U1 R iba [ 19 ],, A1 3Ma,, ( 170m /Ma), U /T > 1,, 18, 60 /Ma (2) A2 ( m, 124m ) :,,,, 50cm ( 1c), 64 63,, U /T < 1, A1 A2, ( ) ; 2) 170m /Ma, Ma (3) A3 ( m, 65m ) : U2 A2, 63 64,, 47 45, ( 1c) U2 O lduvai 20m, 119Ma A1,,,, U /T > 1, Re ( ) > 0; 16, 42 /Ma (4) A4 ( > 140m ) :,, 45 47,, U /T < 1 A3 A4, 1152 < 0170Ma (5) A5: Q Jq,, U3, ( 1b 1c) U3, 21 20, 12,, U /T < < 1,, (6) A6: (U4), 12, 4 5,, Q Gb (U /T < < 1) 2km,, [ 23, 24 ], 1b : 1), ; 3), ; 4) ( fault ramp ) ; 5) -, m, 310Ma 112mm /a 412 -, 2500m, 1500m, - 200m ( [ 23 ] ),,,

9 ,,,,,,, 2200m ( [ 23 ] ) ;, 1900m ( [ 23 ] ) ; ( [ 23 ] ) (A4) 017Ma, ETM, - 3Ma,, 50 30, 150m ( 196m /Ma), 112Ma ( 4) 14km, - 718km /Ma, 418Ma 5,,, - 275, 246,, Cande Kent [ 37 ] C3n14n B runhes,, 4Ma, 3155Ma 017Ma, < 017Ma,, 3Ma, 260m /Ma 170m /Ma Ma (A1), 18, 60 /Ma Ma (A2) Ma (A3), 16, 42 /Ma Ma (U3), 24, 16, 23 /Ma,, Ma 170m /Ma; 61, 26 /Ma; 1900m, 830m /Ma 3Ma, 3600m, 112mm /a; 3200m, 111mm /a 112Ma, -, 718km /Ma - 50km /Ma ( 3 4mm /a [ 5 ] ),, 10km - [ 45 ] - [ 3, 46 ] [ 47 ],

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12 1 : 31 M AGNETOCHRO NOLO GY O F THE Y UM EN CO NGLOM ERATES AND M UL T I2PUL SED FOLD ING AND THRUST ING IN THE NO RTHERN Q IL IANSHAN Chen J ie K. H. W yrwoll Lu Yanchou B. Krapez W an J inglin L iu J infeng ( S tate Key Laboratory of Earthquake D ynam ics, Institute of Geology, China Earthquake A dm inistration, B eijing ; School of Earth and Geographical Sciences, U niversity of W estern Australia, N edlands 6907, Australia) Abstract Nearly continuous exposure of deformed Plio2Pleistocene sediments reveal that the Laojunm iao fold2and2thrust belt is particularly favorable for determ ining the geometry, style, tim ing, and rate of active faulting and folding within a foreland basin along the northern margin of the Q ilianshan. Paleomagnetic investigations of two Plio2Pleistocene terrestrial successions p rovide detailed magnetostratigraphy for the Upper Cenozoic strata in this region. Results show that the conglomeratic Yumen Formation is diachronous with the basal age ranging from ca. 4Ma in the N iugetao section to ca Ma in the Q ingcaowan west section ca. 14km to the northwest on the northeast limb of the anticline. Northwestward lateral p ropagation and growth of the Laojunm iao fold2and2thrust belt initiated at ca. 3Ma in the N iugetao, and ca. 1. 2Ma in the Q ingcaowan west with a rate of ca. 718km /Ma. The cross section in the N iugetao p rovides a conservative estimate of shortening rate of 112mm /a and up lift rate of 1. 1mm /a since ca. 3Ma. Detailed mapp ing of the rotational offlap onlap geometrical growth strata at the forelimb indicates multi2pulsed folding and thrusting, which suggests that the Laojunm iao fold2and2thrust belt developed as a result of northeastward m igration and p ropagation of thrusting and folding of the northeastern edge of the Q inghai2tibetan Plateau. Key words Qilianshan, Yumen conglomerates, magnetostratigraphy, growth fold, growth strata, lateral propagation M etasequoia glyptostroboides Hu et Cheng 20,,, ( The 2nd International M etasequoia Symposium M etasequoia and associated p lants: Evolution, physiology, horticulture, and conservation), ( ), (B ryant University) ( Yale University) ; 3 ( ; ) :,, web. bryant. edu / china : Prof. D r. Hong Yang ( ) Prof. D r. Leo H ickey College of A rts & Sciences B ryant University Department of Geology & Geophysics Yale University 1150 Douglas Pike P. O. Box Sm ithfield, R I 02917, USA New Haven, CT , USA Tel: Tel: Fax: Fax: E2mail: hyang@ bryant. edu E2mail: leo. hickey@ yale. edu

14 17.,., Fig. 1 Bougeur gravity map of research region 2 Fig. 2 Magnetic map of research region

14 17.,., Fig. 1 Bougeur gravity map of research region 2 Fig. 2 Magnetic map of research region 1 7 1 Vol. 17 No. 1 2002 3 (13 23) PROGRESS IN GEOPHYSICS March 2002 (,,100101) [ ],, 39.,,. [ ] ; ; [] P738 [] A [ ]100422903 (2002) 0120013211 0,,.,,, NE [1 ],.., ( NE, EW,NE ),.,.,,. 1 20 20 km ( 10