This README.txt file was generated on 2021-03-26 by QUESNEL Yoann
It describes the information about the datasets accompanying the study
of Quesnel et al. on the Karla impact structure (Russia).

GENERAL INFORMATION

1. Title of Datasets: GeoKarla

2. Author Information
	Name: QUESNEL Yoann
	Institution: Aix-Marseille University, CEREGE, France
	Address: CEREGE, Technopole de l'Arbois Mediterranee, BP80, 13545 Aix-en-Provence cedex 04, France
	Email: quesnel@cerege.fr

3. Date of data collection (single date, range, approximate date): 2019-09

4. Geographic location of data collection: 54.95°N, 47.97°E, nearby Buinsk, Tatarstan, Russia

5. Information about funding sources that supported the collection of the data:
	Russian Foundation for Basic Research RFBR grant no.18-55-15014
	CNRS PRC French program


SHARING/ACCESS INFORMATION

1. Licenses/restrictions placed on the data: will be public after publication of the corresponding article

2. Links to publications that cite or use the data: (coming soon)

3. Links to other publicly accessible locations of the data: 

4. Links/relationships to ancillary data sets: 

5. Was data derived from another source? no
	A. If yes, list source(s): 

6. Recommended citation for this dataset: (coming soon) 


DATA & FILE OVERVIEW

File List: 
	MagneticFieldData.csv: ground magnetic field intensity measurements over the Karla impact structure (Russia)
	GravimetricData.csv: Bouguer gravimetric anomaly data over the Karla impact structure (Russia)
	SampleMeasurements.csv: petrophysical measurements on samples collected in the Karla impact structure (Russia)

METHODOLOGICAL INFORMATION

1. Description of methods used for collection/generation of data: 
	Magnetic Field Data: ground survey using MMPOS-1 magnetometer at ~2 m height, and associated GPS device
	Gravimetric Data: ground survey using 2 Scintrex CG-5 gravimeters, and a dGPS system for precise positioning
	Petrophysical Measurements: a Quantachrome Helium stereopycnometer was used to measure the bulk density of the rock samples, an AGICO MFK1 Kappabridge allows to measure their magnetic susceptibility, and a Superconducting Quantum Interference Devices (SQUID) 760R (2G Entreprises) gave the remanent magnetization


2. Methods for processing the data: 
	Magnetic Field Data: the internal and external global magnetic field influences were removed using our own base station, then filtering, reduction-to-the-pole, detrending and interpolation were applied on this anomaly dataset.
	Gravimetric Data: the drift of the gravimeters was removed using regular return-to-the-base during the survey; all data were leveled to a single reference point, and then classical gravimetric corrections were applied to extract the complete Bouguer gravimetric anomaly, using a regional crustal density of 2100 kg/m3
	Petrophysical Measurements: the density, magnetic susceptibility and remanence measurements were averaged for each sampling site

3. Environmental/experimental conditions: these measurements were acquired during good weather conditions, in crop fields and forests.

4. People involved with sample collection, processing, analysis and/or submission: see the associated publication (coming soon)

DATA-SPECIFIC INFORMATION FOR: MagneticFieldData.csv
1. Number of variables: 4
2. Number of cases/rows: 6216
3. Variable List: 
	Lon: Longitude (°E)
	Lat: Latitude (°N)
	Ano: Magnetic field anomaly (nT)
	RTP: Reduced-to-the-Pole detrended magnetic field anomaly (nT)

DATA-SPECIFIC INFORMATION FOR: GravimetricData.csv
1. Number of variables: 4
2. Number of cases/rows: 146
3. Variable List: 
	Lon: Longitude (°E)
	Lat: Latitude (°N)
	Elev: Surface Elevation (m) (WGS84 datum)
	BA: Bouguer anomaly (mGal)

DATA-SPECIFIC INFORMATION FOR: SampleMeasurements.csv
1. Number of variables: 8
2. Number of cases/rows: 8
3. Variable List: 
	Site: sampling site reference
	X: East coordinates in UTM39 projection with WGS84 datum (m)
	Y: North coordinates in UTM39 projection with WGS84 datum (m)
	Loc: Location information about the sampling site
	Litho: Lithology of the sampling site (IMB: Impact Breccia)
	d: Averaged density of the samples coming from the same site (SI)
	k: Averaged magnetic susceptibility of the samples coming from the same site (SI)
	NRM: Averaged Natural Remanent Magnetization of the samples coming from the same site (A/m)
4. Missing data codes: -