\documentclass[10pt]{article}

\usepackage{fullpage}
\usepackage{setspace}
\usepackage{parskip}
\usepackage{titlesec}
\usepackage[section]{placeins}
\usepackage{xcolor}
\usepackage{breakcites}
\usepackage{lineno}
\usepackage{hyphenat}





\PassOptionsToPackage{hyphens}{url}
\usepackage[colorlinks = true,
            linkcolor = blue,
            urlcolor  = blue,
            citecolor = blue,
            anchorcolor = blue]{hyperref}
\usepackage{etoolbox}
\makeatletter
\patchcmd\@combinedblfloats{\box\@outputbox}{\unvbox\@outputbox}{}{%
  \errmessage{\noexpand\@combinedblfloats could not be patched}%
}%
\makeatother


\usepackage{natbib}




\renewenvironment{abstract}
  {{\bfseries\noindent{\abstractname}\par\nobreak}\footnotesize}
  {\bigskip}

\titlespacing{\section}{0pt}{*3}{*1}
\titlespacing{\subsection}{0pt}{*2}{*0.5}
\titlespacing{\subsubsection}{0pt}{*1.5}{0pt}


\usepackage{authblk}


\usepackage{graphicx}
\usepackage[space]{grffile}
\usepackage{latexsym}
\usepackage{textcomp}
\usepackage{longtable}
\usepackage{tabulary}
\usepackage{booktabs,array,multirow}
\usepackage{amsfonts,amsmath,amssymb}
\providecommand\citet{\cite}
\providecommand\citep{\cite}
\providecommand\citealt{\cite}
% You can conditionalize code for latexml or normal latex using this.
\newif\iflatexml\latexmlfalse
\providecommand{\tightlist}{\setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}%

\AtBeginDocument{\DeclareGraphicsExtensions{.pdf,.PDF,.eps,.EPS,.png,.PNG,.tif,.TIF,.jpg,.JPG,.jpeg,.JPEG}}

\usepackage[utf8]{inputenc}
\usepackage[ngerman,english]{babel}



\usepackage{float}








\begin{document}

\title{Native H2 exploration in the western Pyrenean foothills}



\author[1]{Nicolas Lefeuvre}%
\author[2]{Laurent Truche}%
\author[1]{Frederic Victor DONZE}%
\author[3]{Maxime Ducoux}%
\author[4]{Guillaume Barré}%
\author[5]{Rose-Adeline Fakoury}%
\author[6]{Sylvain Calassou}%
\author[7]{Eric Gaucher}%
\affil[1]{Université Grenoble Alpes}%
\affil[2]{ISTerre}%
\affil[3]{M\&U sasu}%
\affil[4]{Université de Pau et Pays de l'Adour}%
\affil[5]{Total SA}%
\affil[6]{TOTAL}%
\affil[7]{Centre Scientifique et Technique}%


\vspace{-1em}



  
  \date{May 27, 2024}


\begingroup
\let\center\flushleft
\let\endcenter\endflushleft
\maketitle
\endgroup





\selectlanguage{english}
\begin{abstract}
Native hydrogen (H2) may represent a new carbon free energy resource,
but to date there is no specific exploration guide to target H2-fertile
geological settings. Here, we present the first soil gas survey
specifically designed to explore H2 migration in a region where no
surface seepage has been documented so far. We choose the Pyrenean
orogenic belt and its northern foreland basin (Aquitaine, France) as a
playground to test our strategy. The presence of a mantle body at
shallow depth (\textless{} 10 km) under the Maul\selectlanguage{ngerman}éon Basin connected to
the surface by major faults is considered as a preliminary pathfinder
for H2 generation and drainage. On this basis, more than 1,100 in situ
soil gas analysis (H2, CO, CO2, CH4, H2S, and 222Rn) were performed at
\textasciitilde{}1 m depth at the regional scale along a 10 x 10 km grid
spanning over 7,500 km2. The analysis campaign reveals several hot spots
to the north of the Mauléon Basin where H2, CO2 and 222Rn concentrations
exceed 1000 ppmv, 10 vol\% and 50 kBq m-3, respectively. Most of these
hot spots are located along the North Pyrenean Frontal Thrust and other
related faults rooted in the mantle body. These results, together with
evidence of fluid migration at depth, suggest that H2 may be sourced
from mantle rocks serpentinization and carried to the surface along
major thrusting faults. Hydrogen traps remain unidentified up to now but
the presence of salt-related structures (diapirs) near these hot spots
could play this role.%
\end{abstract}\selectlanguage{ngerman}%



\sloppy




\selectlanguage{english}
\FloatBarrier
\end{document}

