Outline

The CHIME age calculation program

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This program is a part of the GSD (GANKO Software Distribution). Before downloading a program, please read the GSD general license term.

1. Introduction

The CHIME age calculation program provided here calculates the CHIME age (Suzuki and Adachi, 1991, 1994) with York's linear fitting procedure (York, 1966). Decay constants are obtained from Steiger and Jäger (1977). Details of this program are described in Kato et al., (1999).

The PDF file of Kato et al. (1999 online revision 3) is available from http://demo2.sg-files.com/others/nu_nendai/media/paper/kato1999-4.pdf.

2. License

Please include papers described in the REFERENCE section in your publications that use results of this program.

Example
The CHIME (Suzuki and Adachi, 1991, 1994) age was calculated by the computer program in Kato et al. (1999) with York (1966) method and decay constants from Steiger and Jäger (1977).

3. Distributions

There are two versions of distributions. One is compiled on FreeBSD 2.2.8 box. It runs on both 2.2.8 and higher (including 3.x and current). If you use this version on FreeBSD 3.x and higher, you may need to install the compat22 (c.f. FreeBSD project's page). Another is compiled on FreeBSD 3.4 box. It does not run on 2.2.8 nor earlier.

Following distributions are not well tested and will not be updated.

Note:

  • The term PC-98 includes NEC PC-9801, PC-9821 and EPSON's compatibles. The NEC PC-98 NX is NOT included.
  • MacOS X version works as a Unix command. Please use it in the Terminal application.
  • Windows version is a Win32 console application. Please use it in the Command Prompt or MS-DOS Prompt.

4. Limitation

Before creating input file, please be aware of following limitations.

4.1. FreeBSD version

  • The length of a spot ID should be less than 100.
  • The number of spots should be less than 1000.

4.2. Other architecture

  • Program is not well tested.
  • The length of a spot ID should be less than 100.
  • The number of spots should be less than 1000.

5. Installation

5.1 FreeBSD

Become root and type 

pkg_add chime-1.0.tgz

You may have

  • /usr/local/bin/chime
    Executable binary file
  • /usr/local/man/man1/chime.1.gz
    Manual page

5.2 NetBSD/sparc

Become root and type 

pkg_add chime-1.0.tgz

You may have

  • /usr/pkg/bin/chime
    Executable binary file
  • /usr/pkg/man/man1/chime.1.gz
    Manual page

5.3 Classic MacOS

Decode the BinHex format file, and you may find chime-carbon-1.0.smi file. Double click this smi file to mount, then the chime-1.0 folder will be appeared. In the chime-1.0 folder, you may find chime application, documents and sample files.

Note: This program requires the Cabon library (included in MacOS 9.2).

6. Preparing data file

Data used by the program should be stored in a text file. Each line contains seven fields. Each fields should be separated by white space (e.g. space and tab) and each items should no be contain any white space.

7. Command line options

-t shows Th-rich mineral mode. Use this option when you calculate the CHIME age of ThO2 rich mineral (e.g. monazite).
-u show U-rich mineral mode. Use this option when you calculate the CHIME age of UO2 rich mineral (e.g. zircon).
-v displays analysis results, apparent age and RO2* for each spot.
-f file tells file for input. If this option is not set, the program read data from standard input.
-m assumes that concentrations are of metals instead of oxides. Default is oxide mode.

8. Example

8.1. Monazite

(The sample file is available from here. )
Since monazite is of ThO2 rich mineral, you must specify `-t' option. 


% chime -t -f monazite 
Number of data point: 14                MSWD=0.157437
Age / Ma = 253.156361   +/-   23.731568
inclination = 0.010694   +/-   0.001009
intercept = -0.000901   +/-   0.010499

8.2. Zircon

(The sample file is available from here.)
Since zircon is of UO2 rich mineral, you must specify `-u' option. 


Number of data point: 8         MSWD=0.071520
Age / Ma = 2035.680177   +/-   58.355947
inclination = 0.341159   +/-   0.012659
intercept = -0.002484   +/-   0.003832

Spot No. ThO2   Error  UO2   Error  PbO   Error  Age  RO2*
Z209-1  0.0830 10.0  0.1860 10.0  0.0690 10.0 1994  0.2077
Z209-2  0.1550 10.0  0.1870 10.0  0.0770 10.0 2023  0.2275
Z209-3  0.1810 10.0  0.3140  5.0  0.1190  5.0 1980  0.3613
Z209-4  0.3020  5.0  0.3920  5.0  0.1590  5.0 2019  0.4709
Z209-5  0.1430 10.0  0.1120 10.0  0.0500 10.0 2005  0.1493
Z209-6  0.1880 10.0  0.3210  5.0  0.1210  5.0 1968  0.3701
Z209-7  0.0930 10.0  0.1630  5.0  0.0600 10.0 1936  0.1873
Z209-8  0.5440  5.0  0.3990  5.0  0.1860  5.0 2048  0.5411

9. References

Please include following papers in your publications that use results of this program.

  • KATO, T., SUZUKI, K. and ADACHI, M. (1999)
    The computer program for the CHIME age calculation. Journal of Earth and Planetary Sciences Nagoya University, 46, 49 - 56.
  • STEIGER, R.H. and JÄGER, E. (1977)
    Subcommission on geochronology: convention on the use of decay constants in geo- and cosmochronology. Earth and Planetary Science Letters, 36, 359 - 362.
  • SUZUKI, K. and ADACHI, M. (1991)
    Precambrian provenance and Silurian metamorphism of the Tsubonosawa paragneiss in the South Kitakami terrane, Northeast Japan, revealed by the chemical Th-U-total Pb isochron ages of monazite, zircon and xenotime. Geochemical Journal, 25, 357 - 376.
  • SUZUKI, K. and ADACHI, M. (1994)
    Middle Precambrian detrital monazite and zircon from the Hida gneiss in the Oki-Dogo Island, Japan: their origin and implication for the correlation of the basement of Southwest Japan and Korea. Tectonophysics, 235, 277 - 292.
  • YORK, D. (1966)
    Least-squares fitting of a straight line. Canadian Journal of Physics, 44, 1079 - 1088.

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