N. Aadil


Northland Allochthon, a bathyal depth sediments, comprises an originally fining-upwards passive margin wedge which accumulated adjacent to northeastern New Zealand between mid-Cretaceous and latest Oligocene. The Northland Allochthon is overlain by Miocene arc and arc-basin deposits. This paper provides clay mineralogy and its transformation of different lithofacies of the Northland Allochthon rocks of North Island, New Zealand to understand the processes of precipitation during deposition and diagenesis of these rocks and possible later effects associated with obduction and re-burial of these rocks. The clay mineral sequence observed in the study area is from smectite to illite through illite/smectite interstratified mixed-layered clays. X-Ray diffractometry and Scanning Electron Microscopy of mixed-layer illite/smectite (I/S) clay from sandstone and shale shows a progressive increase in illite layers with increasing age.

Full Text:



E. Abdullayev, E.W. Ehrmann, C. Khalifazade

and E. Huseynov (ANAS). Distribution of Clay

Mineral Assemblages in Lower Pliocene

Sediments, Western Flank of the South Caspian

Sea. 74 EAGE Conference & Exhibition

incorporating SPE EUROPEC 2012, Copenhagen,

Denmark (2012) 4-7.

R.E. White. Introduction to the Principles and

Practice of Soil Science, Blackwell Scientific

Publ. Inc. (1987).

C. Yang and R. Hesse, Clay Minerals 26 (1991)

B. Velde, Mineralogical Magzine 49 (1985) 387.

C. Buhmann. Clays and Clay Minerals 40 (1992)


H. Lindgreen, Clays and Clay Minerals 39, No.1

(1991) 54.

H.K. Chang, F.T. McKenzie and J. Schoonmaker,

Clays and Cay Minerals 34 (1986) 407.

R.M. Pollastro, Clays and Clay Minerals 33 (1985)

P.F. Ballance and K.B. Sporli, Journal of Royal

Society of New Zealand 9 (1979) 259.

F.J. Brook, M.J. Isaac and B.W. Hayward. Geology

of Autochthonous and Allochthonous Sequence of

Between Kaitaia and Whangaroa, Northern New

Zealand. N.Z. Geolgical Survey Record (1988).

F. J. Brook. Sheets N1 and N2 - North Cape.

Geological Maps of New Zealand, Department of

Scientific and Industrial Research, Wellington 1,

No. 63 (1989) 360.

M.J. Isaac and P.L. Grieve, RSNZ Bulletin 26

(1989) 95.

A. Steiner, Clays and Clay Minerals 16 (1968) 193.

J.S. Compton. Clays and Clay Minerals 39, No. 5

(1991) 449.

E. Perry and J. Hower, Clays and Clay Minerals

(1970) 165.

D.D. Eberl and J. Hower, Geological Society of

American Bulletin 87 (1976) 326.

A. Iijima. Geological Occurrences of Zeolite in

Marine Environments, In Natural Zeolites

Occurrence, Properties Use, L.B. Sand and F.A.

Mumpton (eds.) Pergamon Press, New York

(1978) pp. 175-198.

H.J. Kisch. J. of Metamorphic Geology 9 (1991)

A. Iijima, M. Uttada and R.F. Gould, Am. Chem.

Soc. (1971) 342.


  • There are currently no refbacks.